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[SimplifyCFG] FoldTwoEntryPHINode(): don't fold if either block has it's address taken

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Same as with HoistThenElseCodeToIf() (ad87761925c2790aab272138b5bbbde4a93e0383).
This commit is contained in:
Roman Lebedev 2021-06-20 12:33:57 +03:00
parent 9120098319
commit 21a466ca4d
3 changed files with 38 additions and 1 deletions
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5
lib/Transforms/Utils/SimplifyCFG.cpp
View File

@ -2819,6 +2819,11 @@ static bool FoldTwoEntryPHINode(PHINode *PN, const TargetTransformInfo &TTI,
}
assert(DomBlock && "Failed to find root DomBlock");
// If either of the blocks has it's address taken, we can't do this fold.
if ((IfBlock1 && IfBlock1->hasAddressTaken()) ||
(IfBlock2 && IfBlock2->hasAddressTaken()))
return Changed;
LLVM_DEBUG(dbgs() << "FOUND IF CONDITION! " << *IfCond
<< " T: " << IfTrue->getName()
<< " F: " << IfFalse->getName() << "\n");

14
test/CodeGen/AArch64/inlineasm-S-constraint.ll
View File

@ -31,3 +31,17 @@ common.ret:
%common.retval = phi i32 [ 0, %loc ], [ 42, %loc2 ]
ret i32 %common.retval
}
define i32 @test_inline_constraint_S_label_tailmerged2(i1 %in) {
; CHECK-LABEL: test_inline_constraint_S_label_tailmerged2:
call void asm sideeffect "adr x0, $0", "S"(i8* blockaddress(@test_inline_constraint_S_label_tailmerged2, %loc))
; CHECK: adr x0, .Ltmp{{[0-9]+}}
br i1 %in, label %loc, label %loc2
common.ret:
%common.retval = phi i32 [ 0, %loc ], [ 42, %loc2 ]
ret i32 %common.retval
loc:
br label %common.ret
loc2:
br label %common.ret
}

18
test/Transforms/SimplifyCFG/hoist-from-addresstaken-block.ll
View File

@ -19,3 +19,21 @@ common.ret:
%common.retval = phi i32 [ 0, %loc ], [ 42, %loc2 ]
ret i32 %common.retval
}
define i32 @test_inline_constraint_S_label_tailmerged2(i1 %in) {
; CHECK-LABEL: @test_inline_constraint_S_label_tailmerged2(
; CHECK-NEXT: common.ret:
; CHECK-NEXT: call void asm sideeffect "adr x0, $0", "S"(i8* blockaddress(@test_inline_constraint_S_label_tailmerged, [[COMMON_RET:%.*]]))
; CHECK-NEXT: [[DOT:%.*]] = select i1 [[IN:%.*]], i32 0, i32 42
; CHECK-NEXT: ret i32 [[DOT]]
;
call void asm sideeffect "adr x0, $0", "S"(i8* blockaddress(@test_inline_constraint_S_label_tailmerged, %loc))
br i1 %in, label %loc, label %loc2
common.ret:
%common.retval = phi i32 [ 0, %loc ], [ 42, %loc2 ]
ret i32 %common.retval
loc:
br label %common.ret
loc2:
br label %common.ret
}