diff options
| author | Chris Lattner <sabre@nondot.org> | 2008-01-25 05:46:26 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-01-25 05:46:26 +0000 |
| commit | af723b9ae460aa42388ee15a79b68bb1c66e9775 (patch) | |
| tree | eb62818a23874fa1e14d81bb28a098140e36a46e /test/CodeGen | |
| parent | 8eea3392984428930b287aecb160c2feda981a13 (diff) | |
Add target-specific dag combines for FAND(x,0) and FOR(x,0). This allows
us to compile:
double test(double X) {
return copysign(0.0, X);
}
into:
_test:
andpd LCPI1_0(%rip), %xmm0
ret
instead of:
_test:
pxor %xmm1, %xmm1
andpd LCPI1_0(%rip), %xmm1
movapd %xmm0, %xmm2
andpd LCPI1_1(%rip), %xmm2
movapd %xmm1, %xmm0
orpd %xmm2, %xmm0
ret
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46344 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen')
| -rw-r--r-- | test/CodeGen/X86/copysign-zero.ll | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/test/CodeGen/X86/copysign-zero.ll b/test/CodeGen/X86/copysign-zero.ll new file mode 100644 index 0000000000..a08fa6519d --- /dev/null +++ b/test/CodeGen/X86/copysign-zero.ll @@ -0,0 +1,14 @@ +; RUN: llvm-as < %s | llc | not grep orpd +; RUN: llvm-as < %s | llc | grep andpd | count 1 + +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128" +target triple = "x86_64-apple-darwin8" + +define double @test(double %X) nounwind { +entry: + %tmp2 = tail call double @copysign( double 0.000000e+00, double %X ) nounwind readnone ; <double> [#uses=1] + ret double %tmp2 +} + +declare double @copysign(double, double) nounwind readnone + |