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8999dd3c68
us to compile:
#include <math.h>
int t1(double d) { return signbit(d); }
into:
_t1:
movd %xmm0, %rax
shrq $63, %rax
ret
instead of:
_t1:
movd %xmm0, %rax
shrq $32, %rax
shrl $31, %eax
ret
on x86-64.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45311 91177308-0d34-0410-b5e6-96231b3b80d8
11 lines
273 B
LLVM
11 lines
273 B
LLVM
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep lshr.*63
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define i32 @t1(i64 %d18) {
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entry:
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%tmp916 = lshr i64 %d18, 32 ; <i64> [#uses=1]
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%tmp917 = trunc i64 %tmp916 to i32 ; <i32> [#uses=1]
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%tmp10 = lshr i32 %tmp917, 31 ; <i32> [#uses=1]
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ret i32 %tmp10
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}
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