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Fix a test that has no checks. 

X86 doesn't have fneg, so check for xor.

Differential Revision: http://reviews.llvm.org/D4812

llvm-svn: 214992
This commit is contained in:
Sanjay Patel 2014-08-06 20:45:30 +00:00
parent a6dc6c281c
commit cd47959eb6
1 changed files with 17 additions and 5 deletions
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22
llvm/test/CodeGen/X86/vec_fneg.ll
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@ -1,11 +1,23 @@
; RUN: llc < %s -march=x86 -mattr=+sse2
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mcpu=corei7 | FileCheck %s
; FNEG is defined as subtraction from -0.0.
; This test verifies that we use an xor with a constant to flip the sign bits; no subtraction needed.
define <4 x float> @t1(<4 x float> %Q) {
%tmp15 = fsub <4 x float> < float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00 >, %Q
ret <4 x float> %tmp15
; CHECK-LABEL: t1:
; CHECK: xorps {{.*}}LCPI0_0{{.*}}, %xmm0
; CHECK-NEXT: retq
%tmp = fsub <4 x float> < float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00 >, %Q
ret <4 x float> %tmp
}
; This test verifies that we generate an FP subtraction because "0.0 - x" is not an fneg.
define <4 x float> @t2(<4 x float> %Q) {
%tmp15 = fsub <4 x float> zeroinitializer, %Q
ret <4 x float> %tmp15
; CHECK-LABEL: t2:
; CHECK: xorps %[[X:xmm[0-9]+]], %[[X]]
; CHECK-NEXT: subps %xmm0, %[[X]]
; CHECK-NEXT: movaps %[[X]], %xmm0
; CHECK-NEXT: retq
%tmp = fsub <4 x float> zeroinitializer, %Q
ret <4 x float> %tmp
}