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https://github.com/c64scene-ar/llvm-6502.git
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44be1a8d66
define double @foo(double %x, double %y, i1 %c) nounwind {
%a = fdiv double %x, 3.2
%z = select i1 %c, double %a, double %y
ret double %z
}
Was:
_foo:
divsd LCPI0_0(%rip), %xmm0
testb $1, %dil
jne LBB0_2
movaps %xmm1, %xmm0
LBB0_2:
ret
Now:
_foo:
testb $1, %dil
je LBB0_2
divsd LCPI0_0(%rip), %xmm0
ret
LBB0_2:
movaps %xmm1, %xmm0
ret
This avoids the divsd when early exit is taken.
rdar://8454886
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114372 91177308-0d34-0410-b5e6-96231b3b80d8
77 lines
1.9 KiB
LLVM
77 lines
1.9 KiB
LLVM
; RUN: llc < %s -march=x86-64 | FileCheck %s
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; Convert oeq and une to ole/oge/ule/uge when comparing with infinity
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; and negative infinity, because those are more efficient on x86.
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; CHECK: oeq_inff:
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; CHECK: ucomiss
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; CHECK: jb
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define float @oeq_inff(float %x, float %y) nounwind readonly {
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%t0 = fcmp oeq float %x, 0x7FF0000000000000
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%t1 = select i1 %t0, float 1.0, float %y
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ret float %t1
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}
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; CHECK: oeq_inf:
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; CHECK: ucomisd
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; CHECK: jb
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define double @oeq_inf(double %x, double %y) nounwind readonly {
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%t0 = fcmp oeq double %x, 0x7FF0000000000000
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%t1 = select i1 %t0, double 1.0, double %y
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ret double %t1
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}
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; CHECK: une_inff:
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; CHECK: ucomiss
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; CHECK: jae
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define float @une_inff(float %x, float %y) nounwind readonly {
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%t0 = fcmp une float %x, 0x7FF0000000000000
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%t1 = select i1 %t0, float 1.0, float %y
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ret float %t1
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}
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; CHECK: une_inf:
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; CHECK: ucomisd
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; CHECK: jae
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define double @une_inf(double %x, double %y) nounwind readonly {
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%t0 = fcmp une double %x, 0x7FF0000000000000
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%t1 = select i1 %t0, double 1.0, double %y
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ret double %t1
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}
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; CHECK: oeq_neg_inff:
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; CHECK: ucomiss
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; CHECK: jb
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define float @oeq_neg_inff(float %x, float %y) nounwind readonly {
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%t0 = fcmp oeq float %x, 0xFFF0000000000000
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%t1 = select i1 %t0, float 1.0, float %y
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ret float %t1
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}
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; CHECK: oeq_neg_inf:
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; CHECK: ucomisd
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; CHECK: jb
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define double @oeq_neg_inf(double %x, double %y) nounwind readonly {
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%t0 = fcmp oeq double %x, 0xFFF0000000000000
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%t1 = select i1 %t0, double 1.0, double %y
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ret double %t1
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}
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; CHECK: une_neg_inff:
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; CHECK: ucomiss
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; CHECK: jae
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define float @une_neg_inff(float %x, float %y) nounwind readonly {
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%t0 = fcmp une float %x, 0xFFF0000000000000
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%t1 = select i1 %t0, float 1.0, float %y
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ret float %t1
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}
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; CHECK: une_neg_inf:
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; CHECK: ucomisd
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; CHECK: jae
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define double @une_neg_inf(double %x, double %y) nounwind readonly {
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%t0 = fcmp une double %x, 0xFFF0000000000000
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%t1 = select i1 %t0, double 1.0, double %y
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ret double %t1
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}
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