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[X86] Add known bits test for PEXT. NFC

This commit is contained in:
Craig Topper 2020-09-28 22:46:27 -07:00
parent 4fc69ab002
commit a4b1fdec91
2 changed files with 32 additions and 0 deletions
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12
llvm/test/CodeGen/X86/bmi2-x86_64.ll
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@ -74,6 +74,18 @@ define i64 @pext64_load(i64 %x, i64* %y) {
ret i64 %tmp
}
define i64 @pext64_knownbits(i64 %x, i64 %y) {
; CHECK-LABEL: pext64_knownbits:
; CHECK: # %bb.0:
; CHECK-NEXT: movabsq $6148914691236517205, %rax # imm = 0x5555555555555555
; CHECK-NEXT: pextq %rax, %rdi, %rax
; CHECK-NEXT: movl %eax, %eax
; CHECK-NEXT: retq
%tmp = tail call i64 @llvm.x86.bmi.pext.64(i64 %x, i64 6148914691236517205)
%tmp2 = and i64 %tmp, 4294967295
ret i64 %tmp2
}
declare i64 @llvm.x86.bmi.pext.64(i64, i64)
define i64 @mulx64(i64 %x, i64 %y, i64* %p) {

20
llvm/test/CodeGen/X86/bmi2.ll
View File

@ -252,6 +252,26 @@ define i32 @pext32_load(i32 %x, i32* %y) {
ret i32 %tmp
}
define i32 @pext32_knownbits(i32 %x) {
; X86-LABEL: pext32_knownbits:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl $1431655765, %ecx # imm = 0x55555555
; X86-NEXT: pextl %ecx, %eax, %eax
; X86-NEXT: movzwl %ax, %eax
; X86-NEXT: retl
;
; X64-LABEL: pext32_knownbits:
; X64: # %bb.0:
; X64-NEXT: movl $1431655765, %eax # imm = 0x55555555
; X64-NEXT: pextl %eax, %edi, %eax
; X64-NEXT: movzwl %ax, %eax
; X64-NEXT: retq
%tmp = tail call i32 @llvm.x86.bmi.pext.32(i32 %x, i32 1431655765)
%tmp2 = and i32 %tmp, 65535
ret i32 %tmp2
}
declare i32 @llvm.x86.bmi.pext.32(i32, i32)
define i32 @mulx32(i32 %x, i32 %y, i32* %p) {