forked from OSchip/llvm-project
[DSE,MSSA] Add debug counter.
Can be used like -debug-counter=dse-memoryssa-skip=10,dse-memoryssa-counter-count=20 Reviewers: dmgreen, rnk, efriedma, bryant, asbirlea Reviewed By: asbirlea Differential Revision: https://reviews.llvm.org/D72147
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9fff6e823c
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134bab7cd5
llvm
lib/Transforms/Scalar
test/Transforms/DeadStoreElimination/MSSA
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@ -57,6 +57,7 @@
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/DebugCounter.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/raw_ostream.h"
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@ -80,6 +81,9 @@ STATISTIC(NumFastOther, "Number of other instrs removed");
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STATISTIC(NumCompletePartials, "Number of stores dead by later partials");
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STATISTIC(NumModifiedStores, "Number of stores modified");
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DEBUG_COUNTER(MemorySSACounter, "dse-memoryssa",
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"Controls which MemoryDefs are eliminated.");
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static cl::opt<bool>
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EnablePartialOverwriteTracking("enable-dse-partial-overwrite-tracking",
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cl::init(true), cl::Hidden,
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@ -1795,6 +1799,9 @@ bool eliminateDeadStoresMemorySSA(Function &F, AliasAnalysis &AA,
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break;
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}
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if (!DebugCounter::shouldExecute(MemorySSACounter))
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break;
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// Check if NI overwrites SI.
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int64_t InstWriteOffset, DepWriteOffset;
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InstOverlapIntervalsTy IOL;
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@ -0,0 +1,84 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Eliminates store to %R in the entry block.
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; RUN: opt < %s -basicaa -dse -enable-dse-memoryssa -debug-counter=dse-memoryssa-skip=0,dse-memoryssa-count=1 -S | FileCheck --check-prefix=SKIP0-COUNT1 %s
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; Eliminates store to %P in the entry block.
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; RUN: opt < %s -basicaa -dse -enable-dse-memoryssa -debug-counter=dse-memoryssa-skip=1,dse-memoryssa-count=1 -S | FileCheck --check-prefix=SKIP1-COUNT1 %s
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; Eliminates both stores in the entry block.
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; RUN: opt < %s -basicaa -dse -enable-dse-memoryssa -debug-counter=dse-memoryssa-skip=0,dse-memoryssa-count=2 -S | FileCheck --check-prefix=SKIP0-COUNT2 %s
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; Eliminates no stores.
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; RUN: opt < %s -basicaa -dse -enable-dse-memoryssa -debug-counter=dse-memoryssa-skip=2,dse-memoryssa-count=1 -S | FileCheck --check-prefix=SKIP2-COUNT1 %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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define void @test(i32* noalias %P, i32* noalias %Q, i32* noalias %R) {
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; SKIP0-COUNT1-LABEL: @test(
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; SKIP0-COUNT1-NEXT: store i32 1, i32* [[P:%.*]]
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; SKIP0-COUNT1-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
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; SKIP0-COUNT1: bb1:
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; SKIP0-COUNT1-NEXT: br label [[BB3:%.*]]
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; SKIP0-COUNT1: bb2:
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; SKIP0-COUNT1-NEXT: br label [[BB3]]
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; SKIP0-COUNT1: bb3:
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; SKIP0-COUNT1-NEXT: store i32 0, i32* [[Q:%.*]]
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; SKIP0-COUNT1-NEXT: store i32 0, i32* [[R:%.*]]
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; SKIP0-COUNT1-NEXT: store i32 0, i32* [[P]]
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; SKIP0-COUNT1-NEXT: ret void
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;
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; SKIP1-COUNT1-LABEL: @test(
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; SKIP1-COUNT1-NEXT: store i32 1, i32* [[R:%.*]]
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; SKIP1-COUNT1-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
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; SKIP1-COUNT1: bb1:
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; SKIP1-COUNT1-NEXT: br label [[BB3:%.*]]
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; SKIP1-COUNT1: bb2:
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; SKIP1-COUNT1-NEXT: br label [[BB3]]
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; SKIP1-COUNT1: bb3:
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; SKIP1-COUNT1-NEXT: store i32 0, i32* [[Q:%.*]]
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; SKIP1-COUNT1-NEXT: store i32 0, i32* [[R]]
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; SKIP1-COUNT1-NEXT: store i32 0, i32* [[P:%.*]]
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; SKIP1-COUNT1-NEXT: ret void
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;
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; SKIP0-COUNT2-LABEL: @test(
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; SKIP0-COUNT2-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
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; SKIP0-COUNT2: bb1:
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; SKIP0-COUNT2-NEXT: br label [[BB3:%.*]]
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; SKIP0-COUNT2: bb2:
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; SKIP0-COUNT2-NEXT: br label [[BB3]]
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; SKIP0-COUNT2: bb3:
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; SKIP0-COUNT2-NEXT: store i32 0, i32* [[Q:%.*]]
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; SKIP0-COUNT2-NEXT: store i32 0, i32* [[R:%.*]]
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; SKIP0-COUNT2-NEXT: store i32 0, i32* [[P:%.*]]
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; SKIP0-COUNT2-NEXT: ret void
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;
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; SKIP2-COUNT1-LABEL: @test(
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; SKIP2-COUNT1-NEXT: store i32 1, i32* [[P:%.*]]
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; SKIP2-COUNT1-NEXT: store i32 1, i32* [[R:%.*]]
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; SKIP2-COUNT1-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]]
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; SKIP2-COUNT1: bb1:
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; SKIP2-COUNT1-NEXT: br label [[BB3:%.*]]
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; SKIP2-COUNT1: bb2:
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; SKIP2-COUNT1-NEXT: br label [[BB3]]
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; SKIP2-COUNT1: bb3:
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; SKIP2-COUNT1-NEXT: store i32 0, i32* [[Q:%.*]]
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; SKIP2-COUNT1-NEXT: store i32 0, i32* [[R]]
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; SKIP2-COUNT1-NEXT: store i32 0, i32* [[P]]
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; SKIP2-COUNT1-NEXT: ret void
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;
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store i32 1, i32* %P
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store i32 1, i32* %R
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br i1 true, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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br label %bb3
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bb3:
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store i32 0, i32* %Q
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store i32 0, i32* %R
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store i32 0, i32* %P
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ret void
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}
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