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[MergeICmps] Make sure that the comparison only has one use.
Summary: Fixes PR36557. Reviewers: trentxintong, spatel Subscribers: mstorsjo, llvm-commits Differential Revision: https://reviews.llvm.org/D44083 llvm-svn: 327372
This commit is contained in:
Clement Courbet
parent
f044851601
commit
fd88b5baef
@ -177,6 +177,15 @@ bool BCECmpBlock::doesOtherWork() const {
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// BCE atoms, returns the comparison.
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BCECmpBlock visitICmp(const ICmpInst *const CmpI,
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const ICmpInst::Predicate ExpectedPredicate) {
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// The comparison can only be used once:
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// - For intermediate blocks, as a branch condition.
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// - For the final block, as an incoming value for the Phi.
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// If there are any other uses of the comparison, we cannot merge it with
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// other comparisons as we would create an orphan use of the value.
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if (!CmpI->hasOneUse()) {
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DEBUG(dbgs() << "cmp has several uses\n");
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return {};
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}
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if (CmpI->getPredicate() == ExpectedPredicate) {
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DEBUG(dbgs() << "cmp "
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<< (ExpectedPredicate == ICmpInst::ICMP_EQ ? "eq" : "ne")
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100
test/Transforms/MergeICmps/X86/pr36557.ll
Normal file
100
test/Transforms/MergeICmps/X86/pr36557.ll
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@ -0,0 +1,100 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -mergeicmps -mtriple=x86_64-unknown-unknown -S | FileCheck %s --check-prefix=X86
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source_filename = "qabstractitemmodeltester.cpp"
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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--linux-gnu"
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%class.B = type { i32, i32 }
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%class.D = type { i32 }
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%class.C = type { i8 }
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%class.QMessageLogger = type { i8 }
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$_ZN1D7compareI1BS1_EEbRKT_RKT0_PKcS9_S9_i = comdat any
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@.str = private unnamed_addr constant [1 x i8] zeroinitializer, align 1
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; Function Attrs: uwtable
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define linkonce_odr dso_local zeroext i1 @_ZN1D7compareI1BS1_EEbRKT_RKT0_PKcS9_S9_i(%class.D* %this, %class.B* dereferenceable(8) %p1, %class.B* dereferenceable(8) %p2, i8*, i8*, i8*, i32) local_unnamed_addr #0 comdat align 2 {
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; X86-LABEL: @_ZN1D7compareI1BS1_EEbRKT_RKT0_PKcS9_S9_i(
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; X86-NEXT: entry:
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; X86-NEXT: [[REF_TMP:%.*]] = alloca [[CLASS_C:%.*]], align 1
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; X86-NEXT: [[C_I:%.*]] = getelementptr inbounds [[CLASS_B:%.*]], %class.B* [[P2:%.*]], i64 0, i32 0
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; X86-NEXT: [[TMP4:%.*]] = load i32, i32* [[C_I]], align 4
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; X86-NEXT: [[C2_I:%.*]] = getelementptr inbounds [[CLASS_B]], %class.B* [[P1:%.*]], i64 0, i32 0
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; X86-NEXT: [[TMP5:%.*]] = load i32, i32* [[C2_I]], align 4
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; X86-NEXT: [[CMP_ENTRY:%.*]] = icmp eq i32 [[TMP4]], [[TMP5]]
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; X86-NEXT: br i1 [[CMP_ENTRY]], label [[BB1:%.*]], label [[BB2:%.*]]
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; X86: bb1:
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; X86-NEXT: [[M_I:%.*]] = getelementptr inbounds [[CLASS_B]], %class.B* [[P2]], i64 0, i32 1
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; X86-NEXT: [[TMP6:%.*]] = load i32, i32* [[M_I]], align 4
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; X86-NEXT: [[M3_I:%.*]] = getelementptr inbounds [[CLASS_B]], %class.B* [[P1]], i64 0, i32 1
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; X86-NEXT: [[TMP7:%.*]] = load i32, i32* [[M3_I]], align 4
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; X86-NEXT: [[CMP1:%.*]] = icmp eq i32 [[TMP6]], [[TMP7]]
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; X86-NEXT: br label [[BB2]]
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; X86: bb2:
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; X86-NEXT: [[TMP8:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[CMP1]], [[BB1]] ]
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; X86-NEXT: [[FAILUREREPORTINGMODE:%.*]] = getelementptr inbounds [[CLASS_D:%.*]], %class.D* [[THIS:%.*]], i64 0, i32 0
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; X86-NEXT: [[TMP9:%.*]] = load i32, i32* [[FAILUREREPORTINGMODE]], align 4
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; X86-NEXT: [[COND:%.*]] = icmp eq i32 [[TMP9]], 0
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; X86-NEXT: br i1 [[COND]], label [[BB3:%.*]], label [[SW_EPILOG:%.*]]
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; X86: bb3:
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; X86-NEXT: br i1 [[CMP_ENTRY]], label [[BB4:%.*]], label [[BB5:%.*]]
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; X86: bb4:
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; X86-NEXT: [[M_I_I:%.*]] = getelementptr inbounds [[CLASS_B]], %class.B* [[P2]], i64 0, i32 1
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; X86-NEXT: [[TMP10:%.*]] = load i32, i32* [[M_I_I]], align 4
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; X86-NEXT: [[M3_I_I:%.*]] = getelementptr inbounds [[CLASS_B]], %class.B* [[P1]], i64 0, i32 1
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; X86-NEXT: [[TMP11:%.*]] = load i32, i32* [[M3_I_I]], align 4
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; X86-NEXT: [[CMP4:%.*]] = icmp eq i32 [[TMP10]], [[TMP11]]
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; X86-NEXT: br label [[BB5]]
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; X86: bb5:
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; X86-NEXT: [[TMP12:%.*]] = phi i1 [ false, [[BB3]] ], [ [[CMP4]], [[BB4]] ]
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; X86-NEXT: [[TMP13:%.*]] = getelementptr inbounds [[CLASS_C]], %class.C* [[REF_TMP]], i64 0, i32 0
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; X86-NEXT: br label [[SW_EPILOG]]
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; X86: sw.epilog:
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; X86-NEXT: ret i1 [[TMP8]]
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;
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entry:
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%ref.tmp = alloca %class.C, align 1
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%c.i = getelementptr inbounds %class.B, %class.B* %p2, i64 0, i32 0
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%4 = load i32, i32* %c.i, align 4
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%c2.i = getelementptr inbounds %class.B, %class.B* %p1, i64 0, i32 0
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%5 = load i32, i32* %c2.i, align 4
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%cmp_entry = icmp eq i32 %4, %5
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br i1 %cmp_entry, label %bb1, label %bb2
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bb1: ; preds = %entry
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%m.i = getelementptr inbounds %class.B, %class.B* %p2, i64 0, i32 1
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%6 = load i32, i32* %m.i, align 4
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%m3.i = getelementptr inbounds %class.B, %class.B* %p1, i64 0, i32 1
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%7 = load i32, i32* %m3.i, align 4
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%cmp1 = icmp eq i32 %6, %7
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br label %bb2
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bb2: ; preds = %entry, %bb1
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%8 = phi i1 [ false, %entry ], [ %cmp1, %bb1 ]
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%failureReportingMode = getelementptr inbounds %class.D, %class.D* %this, i64 0, i32 0
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%9 = load i32, i32* %failureReportingMode, align 4
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%cond = icmp eq i32 %9, 0
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br i1 %cond, label %bb3, label %sw.epilog
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bb3: ; preds = %bb2
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br i1 %cmp_entry, label %bb4, label %bb5
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bb4: ; preds = %bb3
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%m.i.i = getelementptr inbounds %class.B, %class.B* %p2, i64 0, i32 1
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%10 = load i32, i32* %m.i.i, align 4
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%m3.i.i = getelementptr inbounds %class.B, %class.B* %p1, i64 0, i32 1
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%11 = load i32, i32* %m3.i.i, align 4
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%cmp4 = icmp eq i32 %10, %11
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br label %bb5
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bb5: ; preds = %bb3, %bb4
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%12 = phi i1 [ false, %bb3 ], [ %cmp4, %bb4 ]
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%13 = getelementptr inbounds %class.C, %class.C* %ref.tmp, i64 0, i32 0
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br label %sw.epilog
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sw.epilog: ; preds = %bb2
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ret i1 %8
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}
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