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
diff --git a/test/CodeGen/Mips/2010-07-20-Select.ll b/test/CodeGen/Mips/2010-07-20-Select.ll
index 8b7f9a9..891b5d9 100644
--- a/test/CodeGen/Mips/2010-07-20-Select.ll
+++ b/test/CodeGen/Mips/2010-07-20-Select.ll
@@ -9,12 +9,12 @@
volatile store i32 0, i32* %c, align 4
%0 = volatile load i32* %a, align 4 ; <i32> [#uses=1]
%1 = icmp eq i32 %0, 0 ; <i1> [#uses=1]
-; CHECK: addiu $4, $zero, 3
+; CHECK: addiu $3, $zero, 0
%iftmp.0.0 = select i1 %1, i32 3, i32 0 ; <i32> [#uses=1]
%2 = volatile load i32* %c, align 4 ; <i32> [#uses=1]
%3 = icmp eq i32 %2, 0 ; <i1> [#uses=1]
-; CHECK: addu $4, $zero, $3
-; CHECK: addu $2, $5, $4
+; CHECK: addiu $3, $zero, 3
+; CHECK: addu $2, $5, $3
%iftmp.2.0 = select i1 %3, i32 0, i32 5 ; <i32> [#uses=1]
%4 = add nsw i32 %iftmp.2.0, %iftmp.0.0 ; <i32> [#uses=1]
ret i32 %4