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Ignore dbg intrinsics while hoisting common code in the two blocks up into the branch block.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63687 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2009-02-04 00:03:08 +00:00
parent a04b757109
commit 65085cf7b3
2 changed files with 47 additions and 3 deletions
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17
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -853,7 +853,14 @@ static bool HoistThenElseCodeToIf(BranchInst *BI) {
BasicBlock *BB1 = BI->getSuccessor(0); // The true destination.
BasicBlock *BB2 = BI->getSuccessor(1); // The false destination
Instruction *I1 = BB1->begin(), *I2 = BB2->begin();
BasicBlock::iterator BB1_Itr = BB1->begin();
BasicBlock::iterator BB2_Itr = BB2->begin();
Instruction *I1 = BB1_Itr++, *I2 = BB2_Itr++;
while (isa<DbgInfoIntrinsic>(I1))
I1 = BB1_Itr++;
while (isa<DbgInfoIntrinsic>(I2))
I2 = BB2_Itr++;
if (I1->getOpcode() != I2->getOpcode() || isa<PHINode>(I1) ||
isa<InvokeInst>(I1) || !I1->isIdenticalTo(I2))
return false;
@ -875,8 +882,12 @@ static bool HoistThenElseCodeToIf(BranchInst *BI) {
I2->replaceAllUsesWith(I1);
BB2->getInstList().erase(I2);
I1 = BB1->begin();
I2 = BB2->begin();
I1 = BB1_Itr++;
while (isa<DbgInfoIntrinsic>(I1))
I1 = BB1_Itr++;
I2 = BB2_Itr++;
while (isa<DbgInfoIntrinsic>(I2))
I2 = BB2_Itr++;
} while (I1->getOpcode() == I2->getOpcode() && I1->isIdenticalTo(I2));
return true;

33
test/Transforms/SimplifyCFG/hoist-common-code.dbg.ll Normal file
View File

@ -0,0 +1,33 @@
; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | not grep br
%llvm.dbg.anchor.type = type { i32, i32 }
%llvm.dbg.compile_unit.type = type { i32, { }*, i32, i8*, i8*, i8*, i1, i1, i8* }
@llvm.dbg.compile_units = linkonce constant %llvm.dbg.anchor.type { i32 458752, i32 17 }, section "llvm.metadata" ;
@.str = internal constant [4 x i8] c"a.c\00", section "llvm.metadata" ; <[4 x i8]*> [#uses=1]
@.str1 = internal constant [6 x i8] c"/tmp/\00", section "llvm.metadata" ; <[6 x i8]*> [#uses=1]
@.str2 = internal constant [55 x i8] c"4.2.1 (Based on Apple Inc. build 5636) (LLVM build 00)\00", section "llvm.metadata" ; <[55 x i8]*> [#uses=1]
@llvm.dbg.compile_unit = internal constant %llvm.dbg.compile_unit.type { i32 458769, { }* bitcast (%llvm.dbg.anchor.type* @llvm.dbg.compile_units to { }*), i32 1, i8* getelementptr ([4 x i8]* @.str, i32 0, i32 0), i8* getelementptr ([6 x i8]* @.str1, i32 0, i32 0), i8* getelementptr ([55 x i8]* @.str2, i32 0, i32 0), i1 true, i1 false, i8* null }, section "llvm.metadata" ; <%llvm.dbg.compile_unit.type*> [#uses=1]
declare void @llvm.dbg.stoppoint(i32, i32, { }*) nounwind
declare void @bar(i32)
define void @test(i1 %P, i32* %Q) {
br i1 %P, label %T, label %F
T: ; preds = %0
call void @llvm.dbg.stoppoint(i32 5, i32 0, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*))
store i32 1, i32* %Q
%A = load i32* %Q ; <i32> [#uses=1]
call void @bar( i32 %A )
ret void
F: ; preds = %0
store i32 1, i32* %Q
call void @llvm.dbg.stoppoint(i32 5, i32 0, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*))
%B = load i32* %Q ; <i32> [#uses=1]
call void @bar( i32 %B )
ret void
}