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19579a7a02
Summary:
After introducing the limit for clobber walking, `walkToPhiOrClobber` would assert that the limit is at least 1 on entry.
The test included triggered that assert.
The callsite in `tryOptimizePhi` making the calls to `walkToPhiOrClobber` is structured like this:
```
while (true) {
if (getBlockingAccess()) { // calls walkToPhiOrClobber
}
for (...) {
walkToPhiOrClobber();
}
}
```
The cleanest fix is to check if the limit was reached inside `walkToPhiOrClobber`, and give an allowence of 1.
This approach not make any alias() calls (no calls to instructionClobbersQuery), so the performance condition is enforced.
The limit is set back to 0 if not used, as this provides info on the fact that we stopped before reaching a true clobber.
Reviewers: george.burgess.iv
Subscribers: jlebar, Prazek, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D60479
llvm-svn: 358303
132 lines
3.5 KiB
LLVM
132 lines
3.5 KiB
LLVM
; RUN: opt -S -memoryssa %s | FileCheck %s
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; REQUIRES: asserts
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; CHECK-LABEL: @func()
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; Function Attrs: noinline
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define dso_local void @func() unnamed_addr #0 align 2 {
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entry:
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%NoFinalize.addr = alloca i8, align 1
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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%call8 = call zeroext i1 @foo()
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br i1 %call8, label %if.then9, label %while.cond
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if.then9: ; preds = %entry
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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br label %while.cond
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while.cond: ; preds = %cleanup, %if.then9, %entry
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%call34 = call zeroext i1 @foo()
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call void @blah()
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br i1 %call34, label %while.body, label %while.end
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while.body: ; preds = %while.cond
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%call35 = call zeroext i1 @foo()
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br i1 %call35, label %if.end37, label %if.then36
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if.then36: ; preds = %while.body
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store i32 2, i32* undef, align 4
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br label %cleanup
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if.end37: ; preds = %while.body
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%call38 = call zeroext i1 @foo()
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br i1 %call38, label %if.end46, label %land.lhs.true
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land.lhs.true: ; preds = %if.end37
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call void @blah()
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%call41 = call zeroext i1 @foo()
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br i1 %call41, label %if.then42, label %if.end46
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if.then42: ; preds = %land.lhs.true
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call void @blah()
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br label %if.end46
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if.end46: ; preds = %if.then42, %land.lhs.true, %if.end37
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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br label %cleanup
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cleanup: ; preds = %if.end46, %if.then36
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call void @blah()
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br label %while.cond
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while.end: ; preds = %while.cond
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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%call93 = call zeroext i1 @foo()
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br i1 %call93, label %if.end120, label %if.then94
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if.then94: ; preds = %while.end
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store i32 0, i32* undef, align 4
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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br label %for.cond
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for.cond: ; preds = %for.body, %if.then94
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br i1 undef, label %for.body, label %if.end120
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for.body: ; preds = %for.cond
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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call void @blah()
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br label %for.cond
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if.end120: ; preds = %for.cond, %while.end
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%val = load i8, i8* %NoFinalize.addr, align 1
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ret void
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}
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; Function Attrs: noinline
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declare hidden void @blah() unnamed_addr #0 align 2
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; Function Attrs: noinline
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declare hidden i1 @foo() local_unnamed_addr #0 align 2
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attributes #0 = { noinline }
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