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When the inliner merges allocas, it must keep the larger alignment
For safety, the inliner cannot decrease the allignment on an alloca when merging it with another. I've included two variants of the test case for this: one with DataLayout available, and one without. When DataLayout is not available, if only one of the allocas uses the default alignment (getAlignment() == 0), then they cannot be safely merged. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186425 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
parent
95779b65cf
commit
5a5ebb7f9f
@ -116,7 +116,8 @@ static void AdjustCallerSSPLevel(Function *Caller, Function *Callee) {
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/// any new allocas to the set if not possible.
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static bool InlineCallIfPossible(CallSite CS, InlineFunctionInfo &IFI,
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InlinedArrayAllocasTy &InlinedArrayAllocas,
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int InlineHistory, bool InsertLifetime) {
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int InlineHistory, bool InsertLifetime,
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const DataLayout *TD) {
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Function *Callee = CS.getCalledFunction();
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Function *Caller = CS.getCaller();
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@ -189,6 +190,14 @@ static bool InlineCallIfPossible(CallSite CS, InlineFunctionInfo &IFI,
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bool MergedAwayAlloca = false;
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for (unsigned i = 0, e = AllocasForType.size(); i != e; ++i) {
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AllocaInst *AvailableAlloca = AllocasForType[i];
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unsigned Align1 = AI->getAlignment(),
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Align2 = AvailableAlloca->getAlignment();
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// If we don't have data layout information, and only one alloca is using
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// the target default, then we can't safely merge them because we can't
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// pick the greater alignment.
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if (!TD && (!Align1 || !Align2) && Align1 != Align2)
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continue;
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// The available alloca has to be in the right function, not in some other
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// function in this SCC.
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@ -206,6 +215,11 @@ static bool InlineCallIfPossible(CallSite CS, InlineFunctionInfo &IFI,
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<< *AvailableAlloca << '\n');
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AI->replaceAllUsesWith(AvailableAlloca);
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if (Align1 > Align2 || (!Align1 && TD &&
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TD->getABITypeAlignment(AI->getAllocatedType()) > Align2))
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AvailableAlloca->setAlignment(Align1);
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AI->eraseFromParent();
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MergedAwayAlloca = true;
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++NumMergedAllocas;
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@ -482,7 +496,7 @@ bool Inliner::runOnSCC(CallGraphSCC &SCC) {
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// Attempt to inline the function.
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if (!InlineCallIfPossible(CS, InlineInfo, InlinedArrayAllocas,
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InlineHistoryID, InsertLifetime))
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InlineHistoryID, InsertLifetime, TD))
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continue;
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++NumInlined;
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93
test/Transforms/Inline/alloca-merge-align-nodl.ll
Normal file
93
test/Transforms/Inline/alloca-merge-align-nodl.ll
Normal file
@ -0,0 +1,93 @@
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; RUN: opt < %s -inline -S | FileCheck %s
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; This variant of the test has no data layout information.
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target triple = "powerpc64-unknown-linux-gnu"
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%struct.s = type { i32, i32 }
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define void @foo(%struct.s* byval nocapture readonly %a) {
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entry:
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%x = alloca [2 x i32], align 4
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%a1 = getelementptr inbounds %struct.s* %a, i64 0, i32 0
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%0 = load i32* %a1, align 4, !tbaa !0
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%arrayidx = getelementptr inbounds [2 x i32]* %x, i64 0, i64 0
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store i32 %0, i32* %arrayidx, align 4, !tbaa !0
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%b = getelementptr inbounds %struct.s* %a, i64 0, i32 1
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%1 = load i32* %b, align 4, !tbaa !0
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%arrayidx2 = getelementptr inbounds [2 x i32]* %x, i64 0, i64 1
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store i32 %1, i32* %arrayidx2, align 4, !tbaa !0
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call void @bar(i32* %arrayidx) #2
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ret void
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}
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define void @foo0(%struct.s* byval nocapture readonly %a) {
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entry:
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%x = alloca [2 x i32]
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%a1 = getelementptr inbounds %struct.s* %a, i64 0, i32 0
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%0 = load i32* %a1, align 4, !tbaa !0
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%arrayidx = getelementptr inbounds [2 x i32]* %x, i64 0, i64 0
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store i32 %0, i32* %arrayidx, align 4, !tbaa !0
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%b = getelementptr inbounds %struct.s* %a, i64 0, i32 1
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%1 = load i32* %b, align 4, !tbaa !0
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%arrayidx2 = getelementptr inbounds [2 x i32]* %x, i64 0, i64 1
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store i32 %1, i32* %arrayidx2, align 4, !tbaa !0
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call void @bar(i32* %arrayidx) #2
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ret void
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}
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declare void @bar(i32*) #1
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define void @goo(%struct.s* byval nocapture readonly %a) {
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entry:
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%x = alloca [2 x i32], align 32
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%a1 = getelementptr inbounds %struct.s* %a, i64 0, i32 0
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%0 = load i32* %a1, align 4, !tbaa !0
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%arrayidx = getelementptr inbounds [2 x i32]* %x, i64 0, i64 0
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store i32 %0, i32* %arrayidx, align 32, !tbaa !0
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%b = getelementptr inbounds %struct.s* %a, i64 0, i32 1
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%1 = load i32* %b, align 4, !tbaa !0
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%arrayidx2 = getelementptr inbounds [2 x i32]* %x, i64 0, i64 1
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store i32 %1, i32* %arrayidx2, align 4, !tbaa !0
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call void @bar(i32* %arrayidx) #2
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ret void
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}
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; CHECK-LABEL: @main
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; CHECK: alloca [2 x i32], align 32
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; CHECK-NOT: alloca [2 x i32]
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; CHECK: ret i32 0
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define signext i32 @main() {
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entry:
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%a = alloca i64, align 8
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%tmpcast = bitcast i64* %a to %struct.s*
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store i64 0, i64* %a, align 8
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%a1 = bitcast i64* %a to i32*
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store i32 1, i32* %a1, align 8, !tbaa !0
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call void @foo(%struct.s* byval %tmpcast)
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store i32 2, i32* %a1, align 8, !tbaa !0
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call void @goo(%struct.s* byval %tmpcast)
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ret i32 0
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}
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; CHECK-LABEL: @test0
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; CHECK: alloca [2 x i32], align 32
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; CHECK: alloca [2 x i32]
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; CHECK: ret i32 0
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define signext i32 @test0() {
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entry:
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%a = alloca i64, align 8
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%tmpcast = bitcast i64* %a to %struct.s*
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store i64 0, i64* %a, align 8
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%a1 = bitcast i64* %a to i32*
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store i32 1, i32* %a1, align 8, !tbaa !0
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call void @foo0(%struct.s* byval %tmpcast)
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store i32 2, i32* %a1, align 8, !tbaa !0
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call void @goo(%struct.s* byval %tmpcast)
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ret i32 0
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}
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!0 = metadata !{metadata !"int", metadata !1}
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!1 = metadata !{metadata !"omnipotent char", metadata !2}
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!2 = metadata !{metadata !"Simple C/C++ TBAA"}
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94
test/Transforms/Inline/alloca-merge-align.ll
Normal file
94
test/Transforms/Inline/alloca-merge-align.ll
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@ -0,0 +1,94 @@
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; RUN: opt < %s -inline -S | FileCheck %s
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target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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%struct.s = type { i32, i32 }
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define void @foo(%struct.s* byval nocapture readonly %a) {
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entry:
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%x = alloca [2 x i32], align 4
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%a1 = getelementptr inbounds %struct.s* %a, i64 0, i32 0
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%0 = load i32* %a1, align 4, !tbaa !0
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%arrayidx = getelementptr inbounds [2 x i32]* %x, i64 0, i64 0
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store i32 %0, i32* %arrayidx, align 4, !tbaa !0
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%b = getelementptr inbounds %struct.s* %a, i64 0, i32 1
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%1 = load i32* %b, align 4, !tbaa !0
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%arrayidx2 = getelementptr inbounds [2 x i32]* %x, i64 0, i64 1
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store i32 %1, i32* %arrayidx2, align 4, !tbaa !0
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call void @bar(i32* %arrayidx) #2
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ret void
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}
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define void @foo0(%struct.s* byval nocapture readonly %a) {
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entry:
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%x = alloca [2 x i32]
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%a1 = getelementptr inbounds %struct.s* %a, i64 0, i32 0
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%0 = load i32* %a1, align 4, !tbaa !0
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%arrayidx = getelementptr inbounds [2 x i32]* %x, i64 0, i64 0
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store i32 %0, i32* %arrayidx, align 4, !tbaa !0
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%b = getelementptr inbounds %struct.s* %a, i64 0, i32 1
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%1 = load i32* %b, align 4, !tbaa !0
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%arrayidx2 = getelementptr inbounds [2 x i32]* %x, i64 0, i64 1
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store i32 %1, i32* %arrayidx2, align 4, !tbaa !0
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call void @bar(i32* %arrayidx) #2
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ret void
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}
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declare void @bar(i32*) #1
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define void @goo(%struct.s* byval nocapture readonly %a) {
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entry:
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%x = alloca [2 x i32], align 32
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%a1 = getelementptr inbounds %struct.s* %a, i64 0, i32 0
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%0 = load i32* %a1, align 4, !tbaa !0
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%arrayidx = getelementptr inbounds [2 x i32]* %x, i64 0, i64 0
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store i32 %0, i32* %arrayidx, align 32, !tbaa !0
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%b = getelementptr inbounds %struct.s* %a, i64 0, i32 1
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%1 = load i32* %b, align 4, !tbaa !0
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%arrayidx2 = getelementptr inbounds [2 x i32]* %x, i64 0, i64 1
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store i32 %1, i32* %arrayidx2, align 4, !tbaa !0
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call void @bar(i32* %arrayidx) #2
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ret void
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}
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; CHECK-LABEL: @main
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; CHECK: alloca [2 x i32], align 32
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; CHECK-NOT: alloca [2 x i32]
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; CHECK: ret i32 0
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define signext i32 @main() {
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entry:
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%a = alloca i64, align 8
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%tmpcast = bitcast i64* %a to %struct.s*
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store i64 0, i64* %a, align 8
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%a1 = bitcast i64* %a to i32*
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store i32 1, i32* %a1, align 8, !tbaa !0
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call void @foo(%struct.s* byval %tmpcast)
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store i32 2, i32* %a1, align 8, !tbaa !0
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call void @goo(%struct.s* byval %tmpcast)
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ret i32 0
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}
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; CHECK-LABEL: @test0
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; CHECK: alloca [2 x i32], align 32
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; CHECK-NOT: alloca [2 x i32]
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; CHECK: ret i32 0
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define signext i32 @test0() {
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entry:
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%a = alloca i64, align 8
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%tmpcast = bitcast i64* %a to %struct.s*
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store i64 0, i64* %a, align 8
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%a1 = bitcast i64* %a to i32*
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store i32 1, i32* %a1, align 8, !tbaa !0
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call void @foo0(%struct.s* byval %tmpcast)
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store i32 2, i32* %a1, align 8, !tbaa !0
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call void @goo(%struct.s* byval %tmpcast)
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ret i32 0
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}
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!0 = metadata !{metadata !"int", metadata !1}
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!1 = metadata !{metadata !"omnipotent char", metadata !2}
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!2 = metadata !{metadata !"Simple C/C++ TBAA"}
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