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Update the branch weight metadata when reversing the order of a branch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147280 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2011-12-26 20:54:14 +00:00
parent 9d52310222
commit c9a1aed7fe
2 changed files with 27 additions and 4 deletions
lib/Transforms/Utils
test/Transforms/SimplifyCFG

@ -1603,10 +1603,7 @@ bool llvm::FoldBranchToCommonDest(BranchInst *BI) {
}
PBI->setCondition(NewCond);
BasicBlock *OldTrue = PBI->getSuccessor(0);
BasicBlock *OldFalse = PBI->getSuccessor(1);
PBI->setSuccessor(0, OldFalse);
PBI->setSuccessor(1, OldTrue);
PBI->swapSuccessors();
}
// If we have a bonus inst, clone it into the predecessor block.

@ -0,0 +1,26 @@
; RUN: opt -simplifycfg -S -o - < %s | FileCheck %s
declare void @helper(i32)
define void @test1(i1 %a, i1 %b) {
; CHECK @test1
entry:
br i1 %a, label %Y, label %X, !prof !0
; CHECK: br i1 %or.cond, label %Z, label %Y, !prof !0
X:
%c = or i1 %b, false
br i1 %c, label %Z, label %Y
Y:
call void @helper(i32 0)
ret void
Z:
call void @helper(i32 1)
ret void
}
!0 = metadata !{metadata !"branch_weights", i32 1, i32 2}
; CHECK: !0 = metadata !{metadata !"branch_weights", i32 2, i32 1}