2010-07-20 07:58:51 +00:00
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; RUN: llc < %s -march=mips -relocation-model=static | FileCheck %s
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; Fix PR7473
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define i32 @main() nounwind readnone {
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entry:
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%a = alloca i32, align 4 ; <i32*> [#uses=2]
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%c = alloca i32, align 4 ; <i32*> [#uses=2]
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volatile store i32 1, i32* %a, align 4
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volatile store i32 0, i32* %c, align 4
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%0 = volatile load i32* %a, align 4 ; <i32> [#uses=1]
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%1 = icmp eq i32 %0, 0 ; <i1> [#uses=1]
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Enable machine sinking critical edge splitting. e.g.
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
2010-09-20 22:52:00 +00:00
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; CHECK: addiu $3, $zero, 0
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2010-07-20 07:58:51 +00:00
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%iftmp.0.0 = select i1 %1, i32 3, i32 0 ; <i32> [#uses=1]
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%2 = volatile load i32* %c, align 4 ; <i32> [#uses=1]
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%3 = icmp eq i32 %2, 0 ; <i1> [#uses=1]
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Enable machine sinking critical edge splitting. e.g.
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
2010-09-20 22:52:00 +00:00
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; CHECK: addiu $3, $zero, 3
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; CHECK: addu $2, $5, $3
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2010-07-20 07:58:51 +00:00
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%iftmp.2.0 = select i1 %3, i32 0, i32 5 ; <i32> [#uses=1]
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%4 = add nsw i32 %iftmp.2.0, %iftmp.0.0 ; <i32> [#uses=1]
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ret i32 %4
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}
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