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[X86] Correct pattern for VSQRTSSr_Int, VSQRTSDr_Int, VRCPSSr_Int, and VRSQRTSSr_Int to not have an IMPLICIT_DEF on the first input. The semantics of the intrinsic are clear and not undefined. 

The intrinsic takes one argument, the lower bits are affected by the operation and the upper bits should be passed through. The instruction itself takes two operands, the high bits of the first operand are passed through and the low bits of the second operand are modified by the operation. To match this to the intrinsic we should pass the single intrinsic input to both operands.

I had to remove the stack folding test for these instructions since they depended on the incorrect behavior. The same register is now used for both inputs so the load can't be folded.

llvm-svn: 288779
This commit is contained in:
Craig Topper 2016-12-06 08:07:58 +00:00
parent 4facc13108
commit 5fc7bc91f9
2 changed files with 5 additions and 35 deletions
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2
llvm/lib/Target/X86/X86InstrSSE.td
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@ -3481,7 +3481,7 @@ multiclass avx_fp_unop_s<bits<8> opc, string OpcodeStr, RegisterClass RC,
}
let Predicates = [HasAVX] in {
def : Pat<(Intr VR128:$src),
(!cast<Instruction>("V"#NAME#Suffix##r_Int) (vt (IMPLICIT_DEF)),
(!cast<Instruction>("V"#NAME#Suffix##r_Int) VR128:$src,
VR128:$src)>;
}
let Predicates = [HasAVX, OptForSize] in {

38
llvm/test/CodeGen/X86/stack-folding-fp-avx1.ll
View File

@ -1504,15 +1504,7 @@ define <8 x float> @stack_fold_rcpps_ymm_int(<8 x float> %a0) {
declare <8 x float> @llvm.x86.avx.rcp.ps.256(<8 x float>) nounwind readnone
; TODO stack_fold_rcpss
define <4 x float> @stack_fold_rcpss_int(<4 x float> %a0) {
;CHECK-LABEL: stack_fold_rcpss_int
;CHECK: vrcpss {{-?[0-9]*}}(%rsp), {{%xmm[0-9][0-9]*}}, {{%xmm[0-9][0-9]*}} {{.*#+}} 16-byte Folded Reload
%1 = tail call <2 x i64> asm sideeffect "nop", "=x,~{xmm1},~{xmm2},~{xmm3},~{xmm4},~{xmm5},~{xmm6},~{xmm7},~{xmm8},~{xmm9},~{xmm10},~{xmm11},~{xmm12},~{xmm13},~{xmm14},~{xmm15},~{flags}"()
%2 = call <4 x float> @llvm.x86.sse.rcp.ss(<4 x float> %a0)
ret <4 x float> %2
}
declare <4 x float> @llvm.x86.sse.rcp.ss(<4 x float>) nounwind readnone
; TODO stack_fold_rcpss_int
define <2 x double> @stack_fold_roundpd(<2 x double> %a0) {
;CHECK-LABEL: stack_fold_roundpd
@ -1609,15 +1601,7 @@ define <8 x float> @stack_fold_rsqrtps_ymm_int(<8 x float> %a0) {
declare <8 x float> @llvm.x86.avx.rsqrt.ps.256(<8 x float>) nounwind readnone
; TODO stack_fold_rsqrtss
define <4 x float> @stack_fold_rsqrtss_int(<4 x float> %a0) {
;CHECK-LABEL: stack_fold_rsqrtss_int
;CHECK: vrsqrtss {{-?[0-9]*}}(%rsp), {{%xmm[0-9][0-9]*}}, {{%xmm[0-9][0-9]*}} {{.*#+}} 16-byte Folded Reload
%1 = tail call <2 x i64> asm sideeffect "nop", "=x,~{xmm1},~{xmm2},~{xmm3},~{xmm4},~{xmm5},~{xmm6},~{xmm7},~{xmm8},~{xmm9},~{xmm10},~{xmm11},~{xmm12},~{xmm13},~{xmm14},~{xmm15},~{flags}"()
%2 = call <4 x float> @llvm.x86.sse.rsqrt.ss(<4 x float> %a0)
ret <4 x float> %2
}
declare <4 x float> @llvm.x86.sse.rsqrt.ss(<4 x float>) nounwind readnone
; TODO stack_fold_rsqrtss_int
define <2 x double> @stack_fold_shufpd(<2 x double> %a0, <2 x double> %a1) {
;CHECK-LABEL: stack_fold_shufpd
@ -1696,14 +1680,7 @@ define double @stack_fold_sqrtsd(double %a0) {
}
declare double @llvm.sqrt.f64(double) nounwind readnone
define <2 x double> @stack_fold_sqrtsd_int(<2 x double> %a0) {
;CHECK-LABEL: stack_fold_sqrtsd_int
;CHECK: vsqrtsd {{-?[0-9]*}}(%rsp), {{%xmm[0-9][0-9]*}}, {{%xmm[0-9][0-9]*}} {{.*#+}} 16-byte Folded Reload
%1 = tail call <2 x i64> asm sideeffect "nop", "=x,~{xmm1},~{xmm2},~{xmm3},~{xmm4},~{xmm5},~{xmm6},~{xmm7},~{xmm8},~{xmm9},~{xmm10},~{xmm11},~{xmm12},~{xmm13},~{xmm14},~{xmm15},~{flags}"()
%2 = call <2 x double> @llvm.x86.sse2.sqrt.sd(<2 x double> %a0)
ret <2 x double> %2
}
declare <2 x double> @llvm.x86.sse2.sqrt.sd(<2 x double>) nounwind readnone
; TODO stack_fold_sqrtsd_int
define float @stack_fold_sqrtss(float %a0) {
;CHECK-LABEL: stack_fold_sqrtss
@ -1714,14 +1691,7 @@ define float @stack_fold_sqrtss(float %a0) {
}
declare float @llvm.sqrt.f32(float) nounwind readnone
define <4 x float> @stack_fold_sqrtss_int(<4 x float> %a0) {
;CHECK-LABEL: stack_fold_sqrtss_int
;CHECK: vsqrtss {{-?[0-9]*}}(%rsp), {{%xmm[0-9][0-9]*}}, {{%xmm[0-9][0-9]*}} {{.*#+}} 16-byte Folded Reload
%1 = tail call <2 x i64> asm sideeffect "nop", "=x,~{xmm1},~{xmm2},~{xmm3},~{xmm4},~{xmm5},~{xmm6},~{xmm7},~{xmm8},~{xmm9},~{xmm10},~{xmm11},~{xmm12},~{xmm13},~{xmm14},~{xmm15},~{flags}"()
%2 = call <4 x float> @llvm.x86.sse.sqrt.ss(<4 x float> %a0)
ret <4 x float> %2
}
declare <4 x float> @llvm.x86.sse.sqrt.ss(<4 x float>) nounwind readnone
; TODO stack_fold_sqrtss_int
define <2 x double> @stack_fold_subpd(<2 x double> %a0, <2 x double> %a1) {
;CHECK-LABEL: stack_fold_subpd