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| author | Chris Lattner <sabre@nondot.org> | 2007-12-29 08:37:08 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2007-12-29 08:37:08 +0000 |
| commit | 63079f0757785c5c461bafdd3101ee40aeb717fe (patch) | |
| tree | 37d7b2cfa774bb40277cbba69dda31a00ea2d3bd /test/CodeGen/X86/isnan.ll | |
| parent | 69bfbdfaeebf366b70a1aa3ba650685493da9e8c (diff) | |
| download | external_llvm-63079f0757785c5c461bafdd3101ee40aeb717fe.zip external_llvm-63079f0757785c5c461bafdd3101ee40aeb717fe.tar.gz external_llvm-63079f0757785c5c461bafdd3101ee40aeb717fe.tar.bz2 | |
Fold comparisons against a constant nan, and optimize ORD/UNORD
comparisons with a constant. This allows us to compile isnan to:
_foo:
fcmpu cr7, f1, f1
mfcr r2
rlwinm r3, r2, 0, 31, 31
blr
instead of:
LCPI1_0: ; float
.space 4
_foo:
lis r2, ha16(LCPI1_0)
lfs f0, lo16(LCPI1_0)(r2)
fcmpu cr7, f1, f0
mfcr r2
rlwinm r3, r2, 0, 31, 31
blr
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45405 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/isnan.ll')
| -rw-r--r-- | test/CodeGen/X86/isnan.ll | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/test/CodeGen/X86/isnan.ll b/test/CodeGen/X86/isnan.ll new file mode 100644 index 0000000..18fe29a --- /dev/null +++ b/test/CodeGen/X86/isnan.ll @@ -0,0 +1,11 @@ +; RUN: llvm-as < %s | llc -march=x86 -mcpu=yonah | not grep pxor + +; This should not need to materialize 0.0 to evaluate the condition. + +define i32 @test(double %X) nounwind { +entry: + %tmp6 = fcmp uno double %X, 0.000000e+00 ; <i1> [#uses=1] + %tmp67 = zext i1 %tmp6 to i32 ; <i32> [#uses=1] + ret i32 %tmp67 +} + |