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[ScopBuilder] Exclude ignored intrinsics from explicit instruction list. 

Ignored intrinsics are ignored at code generation, therefore do not
need to be part of the instruction list.

Specifically, llvm.lifetime.* intrinisics are removed before code
generation, referencing them would cause a use-after-free error.

Contributed-by: Nandini Singhal <cs15mtech01004@iith.ac.in>

Differential Revision: https://reviews.llvm.org/D33768

llvm-svn: 304483
This commit is contained in:
Michael Kruse 2017-06-01 21:46:27 +00:00
parent a618acf923
commit 678aa336fa
2 changed files with 48 additions and 1 deletions
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3
polly/lib/Analysis/ScopBuilder.cpp
View File

@ -642,7 +642,8 @@ void ScopBuilder::buildStmts(Region &SR) {
std::vector<Instruction *> Instructions;
for (Instruction &Inst : *I->getNodeAs<BasicBlock>()) {
Loop *L = LI.getLoopFor(Inst.getParent());
if (!isa<TerminatorInst>(&Inst) && !canSynthesize(&Inst, *scop, &SE, L))
if (!isa<TerminatorInst>(&Inst) && !isIgnoredIntrinsic(&Inst) &&
!canSynthesize(&Inst, *scop, &SE, L))
Instructions.push_back(&Inst);
}
Loop *SurroundingLoop = LI.getLoopFor(I->getNodeAs<BasicBlock>());

46
polly/test/ScopInfo/intrinsics.ll Normal file
View File

@ -0,0 +1,46 @@
; RUN: opt %loadPolly -polly-scops -analyze -polly-print-instructions < %s | FileCheck %s
;
; Verify that we remove the ignored intrinsics from the instruction list.
;
; CHECK: Instructions {
; CHECK-NEXT: store i32 %i.0, i32* %arrayidx, align 4
; CHECK-NEXT: }
;
; int A[1024];
; void func() {
; for (int i = 0; i < 1024; i++)
; A[i] = i;
; }
;
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
define void @fun() #0 {
entry:
%A = alloca [1024 x i32], align 16
br label %for.cond
for.cond: ; preds = %for.inc, %entry
%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
%cmp = icmp slt i32 %i.0, 1024
br i1 %cmp, label %for.body, label %for.end
for.body: ; preds = %for.cond
%idxprom = sext i32 %i.0 to i64
%arrayidx = getelementptr inbounds [1024 x i32], [1024 x i32]* %A, i64 0, i64 %idxprom
call void @llvm.donothing()
store i32 %i.0, i32* %arrayidx, align 4
br label %for.inc
for.inc: ; preds = %for.body
%inc = add nsw i32 %i.0, 1
br label %for.cond
for.end: ; preds = %for.cond
ret void
}
; Function Attrs: nounwind readnone
declare void @llvm.donothing() #1
attributes #0 = { noinline nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone }