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063a880856
This one is enabled only under -ffast-math (due to rounding/overflows) but allows us to emit shorter code. Before (on FreeBSD x86-64): 4007f0: 50 push %rax 4007f1: f2 0f 11 0c 24 movsd %xmm1,(%rsp) 4007f6: e8 75 fd ff ff callq 400570 <exp2@plt> 4007fb: f2 0f 10 0c 24 movsd (%rsp),%xmm1 400800: 58 pop %rax 400801: e9 7a fd ff ff jmpq 400580 <pow@plt> 400806: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 40080d: 00 00 00 After: 4007b0: f2 0f 59 c1 mulsd %xmm1,%xmm0 4007b4: e9 87 fd ff ff jmpq 400540 <exp2@plt> 4007b9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) Differential Revision: http://reviews.llvm.org/D14045 llvm-svn: 251976
18 lines
490 B
LLVM
18 lines
490 B
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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define double @mypow(double %x, double %y) #0 {
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entry:
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%call = call double @exp(double %x)
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%pow = call double @llvm.pow.f64(double %call, double %y)
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ret double %pow
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}
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; CHECK-LABEL: define double @mypow(
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; CHECK: %call = call double @exp(double %x)
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; CHECK: %pow = call double @llvm.pow.f64(double %call, double %y)
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; CHECK: ret double %pow
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; CHECK: }
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declare double @exp(double) #1
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declare double @llvm.pow.f64(double, double)
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