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| author | Evan Cheng <evan.cheng@apple.com> | 2010-09-20 22:52:00 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-09-20 22:52:00 +0000 |
| commit | 44be1a8d661cfab0cc3d11b0dd158271b2d2ca04 (patch) | |
| tree | f861658312e3811067f4eb78450f351f8f18e8b6 /test/CodeGen/XCore/ashr.ll | |
| parent | e3c65d1ede77c13c4dd0e07c5c908098466a14e0 (diff) | |
| download | external_llvm-44be1a8d661cfab0cc3d11b0dd158271b2d2ca04.zip external_llvm-44be1a8d661cfab0cc3d11b0dd158271b2d2ca04.tar.gz external_llvm-44be1a8d661cfab0cc3d11b0dd158271b2d2ca04.tar.bz2 | |
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
Diffstat (limited to 'test/CodeGen/XCore/ashr.ll')
| -rw-r--r-- | test/CodeGen/XCore/ashr.ll | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/test/CodeGen/XCore/ashr.ll b/test/CodeGen/XCore/ashr.ll index d99808f..4514fdb 100644 --- a/test/CodeGen/XCore/ashr.ll +++ b/test/CodeGen/XCore/ashr.ll @@ -50,9 +50,9 @@ define i32 @f3(i32 %a) { ret i32 %2 } ; CHECK: f3: -; CHECK-NEXT: ashr r1, r0, 32 +; CHECK-NEXT: ashr r0, r0, 32 +; CHECK-NEXT: bf r0 ; CHECK-NEXT: ldc r0, 10 -; CHECK-NEXT: bt r1 ; CHECK: ldc r0, 17 define i32 @f4(i32 %a) { @@ -61,9 +61,9 @@ define i32 @f4(i32 %a) { ret i32 %2 } ; CHECK: f4: -; CHECK-NEXT: ashr r1, r0, 32 +; CHECK-NEXT: ashr r0, r0, 32 +; CHECK-NEXT: bf r0 ; CHECK-NEXT: ldc r0, 17 -; CHECK-NEXT: bt r1 ; CHECK: ldc r0, 10 define i32 @f5(i32 %a) { |