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[IndVarSimplify] Don't insert after a catchswitch

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Widening a PHI requires us to insert a trunc.
The logical place for this trunc is in the same BB as the PHI.
This is not possible if the BB is terminated by a catchswitch.

This fixes PR27133.

llvm-svn: 264926
This commit is contained in:
David Majnemer 2016-03-30 21:12:06 +00:00
parent 21e599d872
commit 16c8169d61
2 changed files with 44 additions and 0 deletions
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6
lib/Transforms/Scalar/IndVarSimplify.cpp
View File

@ -1283,6 +1283,12 @@ Instruction *WidenIV::widenIVUse(NarrowIVDefUse DU, SCEVExpander &Rewriter) {
if (UsePhi->getNumOperands() != 1)
truncateIVUse(DU, DT, LI);
else {
// Widening the PHI requires us to insert a trunc. The logical place
// for this trunc is in the same BB as the PHI. This is not possible if
// the BB is terminated by a catchswitch.
if (isa<CatchSwitchInst>(UsePhi->getParent()->getTerminator()))
return nullptr;
PHINode *WidePhi =
PHINode::Create(DU.WideDef->getType(), 1, UsePhi->getName() + ".wide",
UsePhi);

38
test/Transforms/IndVarSimplify/pr27133.ll Normal file
View File

@ -0,0 +1,38 @@
; RUN: opt -indvars -S < %s | FileCheck %s
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc18.0.0"
define i32 @fn2() personality i32 (...)* @__CxxFrameHandler3 {
entry:
br label %for.cond
for.cond: ; preds = %for.inc, %entry
%c.0 = phi i32 [ %inc, %for.inc ], [ 0, %entry ]
; CHECK: %[[WIDE:.*]] = phi i64
; CHECK: %[[NORM:.*]] = phi i32
; CHECK: invoke void @fn1(i64 %[[WIDE]])
%idxprom = sext i32 %c.0 to i64
invoke void @fn1(i64 %idxprom)
to label %for.inc unwind label %catch.dispatch
catch.dispatch: ; preds = %for.cond
%c.0.lcssa = phi i32 [ %c.0, %for.cond ]
; CHECK: %[[LCSSA:.*]] = phi i32 [ %[[NORM]],
%0 = catchswitch within none [label %catch] unwind to caller
catch: ; preds = %catch.dispatch
%1 = catchpad within %0 [i8* null, i32 64, i8* null]
catchret from %1 to label %exit
exit:
; CHECK: ret i32 %[[LCSSA]]
ret i32 %c.0.lcssa
for.inc: ; preds = %for.cond
%inc = add nsw nuw i32 %c.0, 1
br label %for.cond
}
declare void @fn1(i64 %idxprom)
declare i32 @__CxxFrameHandler3(...)