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llvm-project/llvm/test/CodeGen/X86/lower-vec-shift-2.ll

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Make utils/update_llc_test_checks.py note that the assertions are autogenerated. Also update existing test cases which appear to be generated by it and weren't modified (other than addition of the header) by rerunning it. llvm-svn: 253917
2015-11-24 05:33:58 +08:00
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; RUN: llc -mtriple=x86_64-unknown-unknown -mattr=+sse2 < %s | FileCheck %s --check-prefix=SSE2
; RUN: llc -mtriple=x86_64-unknown-unknown -mattr=+avx < %s | FileCheck %s --check-prefix=AVX
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
define <8 x i16> @test1(<8 x i16> %A, <8 x i16> %B) {
; SSE2-LABEL: test1:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; SSE2: # BB#0: # %entry
; SSE2-NEXT: movd %xmm1, %eax
; SSE2-NEXT: movzwl %ax, %eax
; SSE2-NEXT: movd %eax, %xmm1
; SSE2-NEXT: psllw %xmm1, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; SSE2-NEXT: retq
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
;
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-LABEL: test1:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; AVX: # BB#0: # %entry
; AVX-NEXT: vpxor %xmm2, %xmm2, %xmm2
; AVX-NEXT: vpblendw {{.*#+}} xmm1 = xmm1[0],xmm2[1,2,3,4,5,6,7]
; AVX-NEXT: vpsllw %xmm1, %xmm0, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-NEXT: retq
entry:
%vecinit14 = shufflevector <8 x i16> %B, <8 x i16> undef, <8 x i32> zeroinitializer
%shl = shl <8 x i16> %A, %vecinit14
ret <8 x i16> %shl
}
define <4 x i32> @test2(<4 x i32> %A, <4 x i32> %B) {
; SSE2-LABEL: test2:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; SSE2: # BB#0: # %entry
; SSE2-NEXT: xorps %xmm2, %xmm2
; SSE2-NEXT: movss {{.*#+}} xmm2 = xmm1[0],xmm2[1,2,3]
; SSE2-NEXT: pslld %xmm2, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; SSE2-NEXT: retq
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
;
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-LABEL: test2:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; AVX: # BB#0: # %entry
; AVX-NEXT: vpxor %xmm2, %xmm2, %xmm2
; AVX-NEXT: vpblendw {{.*#+}} xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7]
; AVX-NEXT: vpslld %xmm1, %xmm0, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-NEXT: retq
entry:
%vecinit6 = shufflevector <4 x i32> %B, <4 x i32> undef, <4 x i32> zeroinitializer
%shl = shl <4 x i32> %A, %vecinit6
ret <4 x i32> %shl
}
define <2 x i64> @test3(<2 x i64> %A, <2 x i64> %B) {
; SSE2-LABEL: test3:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; SSE2: # BB#0: # %entry
; SSE2-NEXT: psllq %xmm1, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; SSE2-NEXT: retq
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
;
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-LABEL: test3:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; AVX: # BB#0: # %entry
; AVX-NEXT: vpsllq %xmm1, %xmm0, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-NEXT: retq
entry:
%vecinit2 = shufflevector <2 x i64> %B, <2 x i64> undef, <2 x i32> zeroinitializer
%shl = shl <2 x i64> %A, %vecinit2
ret <2 x i64> %shl
}
define <8 x i16> @test4(<8 x i16> %A, <8 x i16> %B) {
; SSE2-LABEL: test4:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; SSE2: # BB#0: # %entry
; SSE2-NEXT: movd %xmm1, %eax
; SSE2-NEXT: movzwl %ax, %eax
; SSE2-NEXT: movd %eax, %xmm1
; SSE2-NEXT: psrlw %xmm1, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; SSE2-NEXT: retq
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
;
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-LABEL: test4:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; AVX: # BB#0: # %entry
; AVX-NEXT: vpxor %xmm2, %xmm2, %xmm2
; AVX-NEXT: vpblendw {{.*#+}} xmm1 = xmm1[0],xmm2[1,2,3,4,5,6,7]
; AVX-NEXT: vpsrlw %xmm1, %xmm0, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-NEXT: retq
entry:
%vecinit14 = shufflevector <8 x i16> %B, <8 x i16> undef, <8 x i32> zeroinitializer
%shr = lshr <8 x i16> %A, %vecinit14
ret <8 x i16> %shr
}
define <4 x i32> @test5(<4 x i32> %A, <4 x i32> %B) {
; SSE2-LABEL: test5:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; SSE2: # BB#0: # %entry
; SSE2-NEXT: xorps %xmm2, %xmm2
; SSE2-NEXT: movss {{.*#+}} xmm2 = xmm1[0],xmm2[1,2,3]
; SSE2-NEXT: psrld %xmm2, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; SSE2-NEXT: retq
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
;
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-LABEL: test5:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; AVX: # BB#0: # %entry
; AVX-NEXT: vpxor %xmm2, %xmm2, %xmm2
; AVX-NEXT: vpblendw {{.*#+}} xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7]
; AVX-NEXT: vpsrld %xmm1, %xmm0, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-NEXT: retq
entry:
%vecinit6 = shufflevector <4 x i32> %B, <4 x i32> undef, <4 x i32> zeroinitializer
%shr = lshr <4 x i32> %A, %vecinit6
ret <4 x i32> %shr
}
define <2 x i64> @test6(<2 x i64> %A, <2 x i64> %B) {
; SSE2-LABEL: test6:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; SSE2: # BB#0: # %entry
; SSE2-NEXT: psrlq %xmm1, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; SSE2-NEXT: retq
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
;
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-LABEL: test6:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; AVX: # BB#0: # %entry
; AVX-NEXT: vpsrlq %xmm1, %xmm0, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-NEXT: retq
entry:
%vecinit2 = shufflevector <2 x i64> %B, <2 x i64> undef, <2 x i32> zeroinitializer
%shr = lshr <2 x i64> %A, %vecinit2
ret <2 x i64> %shr
}
define <8 x i16> @test7(<8 x i16> %A, <8 x i16> %B) {
; SSE2-LABEL: test7:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; SSE2: # BB#0: # %entry
; SSE2-NEXT: movd %xmm1, %eax
; SSE2-NEXT: movzwl %ax, %eax
; SSE2-NEXT: movd %eax, %xmm1
; SSE2-NEXT: psraw %xmm1, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; SSE2-NEXT: retq
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
;
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-LABEL: test7:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; AVX: # BB#0: # %entry
; AVX-NEXT: vpxor %xmm2, %xmm2, %xmm2
; AVX-NEXT: vpblendw {{.*#+}} xmm1 = xmm1[0],xmm2[1,2,3,4,5,6,7]
; AVX-NEXT: vpsraw %xmm1, %xmm0, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-NEXT: retq
entry:
%vecinit14 = shufflevector <8 x i16> %B, <8 x i16> undef, <8 x i32> zeroinitializer
%shr = ashr <8 x i16> %A, %vecinit14
ret <8 x i16> %shr
}
define <4 x i32> @test8(<4 x i32> %A, <4 x i32> %B) {
; SSE2-LABEL: test8:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; SSE2: # BB#0: # %entry
; SSE2-NEXT: xorps %xmm2, %xmm2
; SSE2-NEXT: movss {{.*#+}} xmm2 = xmm1[0],xmm2[1,2,3]
; SSE2-NEXT: psrad %xmm2, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; SSE2-NEXT: retq
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
;
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-LABEL: test8:
[x86] Switch to using the long '--check-prefix' form which the update_llc_test_checks.py script uses, and refresh the checks in this test. No functionality changed here, just bringing this test up to work with automated updates using the python script. llvm-svn: 228096
2015-02-04 08:58:40 +08:00
; AVX: # BB#0: # %entry
; AVX-NEXT: vpxor %xmm2, %xmm2, %xmm2
; AVX-NEXT: vpblendw {{.*#+}} xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7]
; AVX-NEXT: vpsrad %xmm1, %xmm0, %xmm0
[X86] Avoid introducing extra shuffles when lowering packed vector shifts. When lowering a vector shift node, the backend checks if the shift count is a shuffle with a splat mask. If so, then it introduces an extra dag node to extract the splat value from the shuffle. The splat value is then used to generate a shift count of a target specific shift. However, if we know that the shift count is a splat shuffle, we can use the splat index 'I' to extract the I-th element from the first shuffle operand. The advantage is that the splat shuffle may become dead since we no longer use it. Example: ;; define <4 x i32> @example(<4 x i32> %a, <4 x i32> %b) { %c = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer %shl = shl <4 x i32> %a, %c ret <4 x i32> %shl } ;; Before this patch, llc generated the following code (-mattr=+avx): vpshufd $0, %xmm1, %xmm1 # xmm1 = xmm1[0,0,0,0] vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq With this patch, the redundant splat operation is removed from the code. vpxor %xmm2, %xmm2 vpblendw $3, %xmm1, %xmm2, %xmm1 # xmm1 = xmm1[0,1],xmm2[2,3,4,5,6,7] vpslld %xmm1, %xmm0, %xmm0 retq llvm-svn: 223461
2014-12-05 20:13:30 +08:00
; AVX-NEXT: retq
entry:
%vecinit6 = shufflevector <4 x i32> %B, <4 x i32> undef, <4 x i32> zeroinitializer
%shr = ashr <4 x i32> %A, %vecinit6
ret <4 x i32> %shr
}