llvm-6502/test/CodeGen/X86/blend-msb.ll
Nadav Rotem af59e9adbd When we use the BLEND instruction that uses the MSB as a mask, we can remove
the VSRI instruction before it since it does not affect the MSB.

Thanks Craig Topper for suggesting this.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169638 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-07 21:43:11 +00:00

38 lines
1.2 KiB
LLVM

; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7 -mattr=+sse41 | FileCheck %s
; In this test we check that sign-extend of the mask bit is performed by
; shifting the needed bit to the MSB, and not using shl+sra.
;CHECK: vsel_float
;CHECK: pslld
;CHECK-NEXT: blendvps
;CHECK: ret
define <4 x float> @vsel_float(<4 x float> %v1, <4 x float> %v2) {
%vsel = select <4 x i1> <i1 true, i1 false, i1 false, i1 false>, <4 x float> %v1, <4 x float> %v2
ret <4 x float> %vsel
}
;CHECK: vsel_4xi8
;CHECK: pslld
;CHECK-NEXT: blendvps
;CHECK: ret
define <4 x i8> @vsel_4xi8(<4 x i8> %v1, <4 x i8> %v2) {
%vsel = select <4 x i1> <i1 true, i1 false, i1 false, i1 false>, <4 x i8> %v1, <4 x i8> %v2
ret <4 x i8> %vsel
}
; We do not have native support for v8i16 blends and we have to use the
; blendvb instruction or a sequence of NAND/OR/AND. Make sure that we do not r
; reduce the mask in this case.
;CHECK: vsel_8xi16
;CHECK: psllw
;CHECK-NOT: psraw
;CHECK: pblendvb
;CHECK: ret
define <8 x i16> @vsel_8xi16(<8 x i16> %v1, <8 x i16> %v2) {
%vsel = select <8 x i1> <i1 true, i1 false, i1 false, i1 false, i1 true, i1 false, i1 false, i1 false>, <8 x i16> %v1, <8 x i16> %v2
ret <8 x i16> %vsel
}