forked from OSchip/llvm-project
[GVN] Improve analysis for missed optimization remark
This change tries to handle multiple dominating users of the pointer operand by choosing the most immediately dominating one, if possible. While making this change I also found that the previous implementation had a missing break statement, making all loads with an odd number of dominating users emit an OtherAccess value, so that has also been fixed. Patch by Henrik G Olsson! Differential Revision: https://reviews.llvm.org/D79097
This commit is contained in:
Adam Nemet
parent
15d4ed6d8c
commit
ab1f6ffa56
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@ -931,6 +931,17 @@ static bool isLifetimeStart(const Instruction *Inst) {
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return false;
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}
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/// Assuming To can be reached from both From and Between, does Between lie on
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/// every path from From to To?
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static bool liesBetween(const Instruction *From, Instruction *Between,
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const Instruction *To, DominatorTree *DT) {
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if (From->getParent() == Between->getParent())
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return DT->dominates(From, Between);
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SmallSet<BasicBlock *, 1> Exclusion;
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Exclusion.insert(Between->getParent());
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return !isPotentiallyReachable(From, To, &Exclusion, DT);
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}
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/// Try to locate the three instruction involved in a missed
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/// load-elimination case that is due to an intervening store.
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static void reportMayClobberedLoad(LoadInst *Load, MemDepResult DepInfo,
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@ -944,17 +955,46 @@ static void reportMayClobberedLoad(LoadInst *Load, MemDepResult DepInfo,
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R << "load of type " << NV("Type", Load->getType()) << " not eliminated"
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<< setExtraArgs();
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for (auto *U : Load->getPointerOperand()->users())
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for (auto *U : Load->getPointerOperand()->users()) {
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if (U != Load && (isa<LoadInst>(U) || isa<StoreInst>(U)) &&
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cast<Instruction>(U)->getFunction() == Load->getFunction() &&
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DT->dominates(cast<Instruction>(U), Load)) {
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// FIXME: for now give up if there are multiple memory accesses that
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// dominate the load. We need further analysis to decide which one is
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// that we're forwarding from.
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if (OtherAccess)
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OtherAccess = nullptr;
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else
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// Use the most immediately dominating value
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if (OtherAccess) {
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if (DT->dominates(cast<Instruction>(OtherAccess), cast<Instruction>(U)))
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OtherAccess = U;
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else
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assert(DT->dominates(cast<Instruction>(U),
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cast<Instruction>(OtherAccess)));
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} else
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OtherAccess = U;
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}
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}
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if (!OtherAccess) {
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// There is no dominating use, check if we can find a closest non-dominating
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// use that lies between any other potentially available use and Load.
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for (auto *U : Load->getPointerOperand()->users()) {
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if (U != Load && (isa<LoadInst>(U) || isa<StoreInst>(U)) &&
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cast<Instruction>(U)->getFunction() == Load->getFunction() &&
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isPotentiallyReachable(cast<Instruction>(U), Load, nullptr, DT)) {
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if (OtherAccess) {
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if (liesBetween(cast<Instruction>(OtherAccess), cast<Instruction>(U),
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Load, DT)) {
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OtherAccess = U;
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} else if (!liesBetween(cast<Instruction>(U),
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cast<Instruction>(OtherAccess), Load, DT)) {
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// These uses are both partially available at Load were it not for
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// the clobber, but neither lies strictly after the other.
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OtherAccess = nullptr;
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break;
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} // else: keep current OtherAccess since it lies between U and Load
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} else {
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OtherAccess = U;
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}
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}
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}
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}
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if (OtherAccess)
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R << " in favor of " << NV("OtherAccess", OtherAccess);
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@ -0,0 +1,136 @@
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; RUN: opt < %s -gvn -o /dev/null -pass-remarks-output=%t -S
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; RUN: cat %t | FileCheck %s
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; CHECK: --- !Missed
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; CHECK-NEXT: Pass: gvn
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; CHECK-NEXT: Name: LoadClobbered
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 2, Column: 2 }
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; CHECK-NEXT: Function: multipleUsers
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; CHECK-NEXT: Args:
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; CHECK-NEXT: - String: 'load of type '
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; CHECK-NEXT: - Type: i32
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; CHECK-NEXT: - String: ' not eliminated'
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; CHECK-NEXT: - String: ' in favor of '
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; CHECK-NEXT: - OtherAccess: store
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; CHECK-NEXT: - String: ' because it is clobbered by '
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; CHECK-NEXT: - ClobberedBy: call
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 1, Column: 1 }
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; CHECK-NEXT: ...
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; CHECK: --- !Missed
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; CHECK-NEXT: Pass: gvn
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; CHECK-NEXT: Name: LoadClobbered
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 4, Column: 4 }
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; CHECK-NEXT: Function: multipleUsers
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; CHECK-NEXT: Args:
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; CHECK-NEXT: - String: 'load of type '
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; CHECK-NEXT: - Type: i32
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; CHECK-NEXT: - String: ' not eliminated'
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; CHECK-NEXT: - String: ' in favor of '
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; CHECK-NEXT: - OtherAccess: load
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 2, Column: 2 }
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; CHECK-NEXT: - String: ' because it is clobbered by '
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; CHECK-NEXT: - ClobberedBy: call
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 3, Column: 3 }
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; CHECK-NEXT: ...
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; ModuleID = 'bugpoint-reduced-simplified.bc'
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source_filename = "gvn-test.c"
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Tests that a last clobbering use can be determined even in the presence of
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; multiple users, given that one of them lies on a path between every other
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; potentially clobbering use and the load.
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define dso_local void @multipleUsers(i32* %a, i32 %b) local_unnamed_addr #0 {
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entry:
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store i32 %b, i32* %a, align 4
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tail call void @clobberingFunc() #1, !dbg !10
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%0 = load i32, i32* %a, align 4, !dbg !11
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tail call void @clobberingFunc() #1, !dbg !12
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%1 = load i32, i32* %a, align 4, !dbg !13
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%add2 = add nsw i32 %1, %0
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ret void
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}
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; CHECK: --- !Missed
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; CHECK-NEXT: Pass: gvn
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; CHECK-NEXT: Name: LoadClobbered
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 2, Column: 2 }
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; CHECK-NEXT: Function: multipleUsers2
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; CHECK-NEXT: Args:
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; CHECK-NEXT: - String: 'load of type '
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; CHECK-NEXT: - Type: i32
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; CHECK-NEXT: - String: ' not eliminated'
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; CHECK-NEXT: - String: ' in favor of '
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; CHECK-NEXT: - OtherAccess: store
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; CHECK-NEXT: - String: ' because it is clobbered by '
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; CHECK-NEXT: - ClobberedBy: call
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 1, Column: 1 }
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; CHECK-NEXT: ...
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; CHECK: --- !Missed
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; CHECK-NEXT: Pass: gvn
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; CHECK-NEXT: Name: LoadClobbered
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 4, Column: 4 }
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; CHECK-NEXT: Function: multipleUsers2
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; CHECK-NEXT: Args:
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; CHECK-NEXT: - String: 'load of type '
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; CHECK-NEXT: - Type: i32
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; CHECK-NEXT: - String: ' not eliminated'
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; CHECK-NEXT: - String: ' in favor of '
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; CHECK-NEXT: - OtherAccess: load
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 2, Column: 2 }
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; CHECK-NEXT: - String: ' because it is clobbered by '
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; CHECK-NEXT: - ClobberedBy: call
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 3, Column: 3 }
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; CHECK-NEXT: ...
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; Ignore uses in other functions
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define dso_local void @multipleUsers2(i32 %b) local_unnamed_addr #0 {
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entry:
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store i32 %b, i32* @g, align 4
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tail call void @clobberingFunc() #1, !dbg !15
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%0 = load i32, i32* @g, align 4, !dbg !16
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tail call void @clobberingFunc() #1, !dbg !17
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%1 = load i32, i32* @g, align 4, !dbg !18
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%add3 = add nsw i32 %1, %0
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ret void
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}
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declare dso_local void @clobberingFunc() local_unnamed_addr #0
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@g = external global i32
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define dso_local void @globalUser(i32 %b) local_unnamed_addr #0 {
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entry:
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store i32 %b, i32* @g, align 4
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ret void
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}
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attributes #0 = { "use-soft-float"="false" }
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attributes #1 = { nounwind }
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!llvm.dbg.cu = !{!1}
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!llvm.module.flags = !{!4, !5, !6}
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!llvm.ident = !{!0}
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!0 = !{!"clang version 10.0.0 (git@github.com:llvm/llvm-project.git a2f6ae9abffcba260c22bb235879f0576bf3b783)"}
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!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang version 4.0.0 (trunk 282540) (llvm/trunk 282542)", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !3)
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!2 = !DIFile(filename: "/tmp/s.c", directory: "/tmp")
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!3 = !{}
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!4 = !{i32 2, !"Dwarf Version", i32 4}
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!5 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = !{i32 1, !"PIC Level", i32 2}
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!8 = distinct !DISubprogram(name: "multipleUsers", scope: !2, file: !2, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !1, retainedNodes: !3)
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!9 = !DISubroutineType(types: !3)
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!10 = !DILocation(line: 1, column: 1, scope: !8)
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!11 = !DILocation(line: 2, column: 2, scope: !8)
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!12 = !DILocation(line: 3, column: 3, scope: !8)
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!13 = !DILocation(line: 4, column: 4, scope: !8)
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!14 = distinct !DISubprogram(name: "multipleUsers2", scope: !2, file: !2, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !1, retainedNodes: !3)
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!15 = !DILocation(line: 1, column: 1, scope: !14)
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!16 = !DILocation(line: 2, column: 2, scope: !14)
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!17 = !DILocation(line: 3, column: 3, scope: !14)
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!18 = !DILocation(line: 4, column: 4, scope: !14)
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@ -0,0 +1,205 @@
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; RUN: opt < %s -gvn -o /dev/null -pass-remarks-output=%t -S
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; RUN: cat %t | FileCheck %s
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; ModuleID = 'bugpoint-reduced-simplified.bc'
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source_filename = "gvn-test.c"
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-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: --- !Missed
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; CHECK-NEXT: Pass: gvn
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; CHECK-NEXT: Name: LoadClobbered
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; CHECK-NEXT: Function: nonDominating1
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; CHECK-NEXT: Args:
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; CHECK-NEXT: - String: 'load of type '
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; CHECK-NEXT: - Type: i32
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; CHECK-NEXT: - String: ' not eliminated'
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; CHECK-NEXT: - String: ' in favor of '
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; CHECK-NEXT: - OtherAccess: store
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; CHECK-NEXT: - String: ' because it is clobbered by '
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; CHECK-NEXT: - ClobberedBy: call
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; CHECK-NEXT: ...
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; Confirm that the partial redundancy being clobbered by the call to
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; clobberingFunc() between store and load is identified.
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define dso_local void @nonDominating1(i32* %a, i1 %cond, i32 %b) local_unnamed_addr #0 {
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entry:
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br i1 %cond, label %if.then, label %if.end
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if.then: ; preds = %entry
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store i32 %b, i32* %a, align 4
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br label %if.end
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if.end: ; preds = %if.then, %entry
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tail call void @clobberingFunc() #1
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%0 = load i32, i32* %a, align 4
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%mul2 = shl nsw i32 %0, 1
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store i32 %mul2, i32* %a, align 4
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ret void
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}
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declare dso_local void @clobberingFunc() local_unnamed_addr #0
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; CHECK: --- !Missed
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; CHECK-NEXT: Pass: gvn
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; CHECK-NEXT: Name: LoadClobbered
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 3, Column: 3 }
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; CHECK-NEXT: Function: nonDominating2
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; CHECK-NEXT: Args:
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; CHECK-NEXT: - String: 'load of type '
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; CHECK-NEXT: - Type: i32
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; CHECK-NEXT: - String: ' not eliminated'
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; CHECK-NEXT: - String: ' in favor of '
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; CHECK-NEXT: - OtherAccess: load
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 1, Column: 1 }
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; CHECK-NEXT: - String: ' because it is clobbered by '
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; CHECK-NEXT: - ClobberedBy: call
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 2, Column: 2 }
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; CHECK-NEXT: ...
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; CHECK: --- !Missed
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; CHECK-NEXT: Pass: gvn
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; CHECK-NEXT: Name: LoadClobbered
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 5, Column: 5 }
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; CHECK-NEXT: Function: nonDominating2
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; CHECK-NEXT: Args:
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; CHECK-NEXT: - String: 'load of type '
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; CHECK-NEXT: - Type: i32
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; CHECK-NEXT: - String: ' not eliminated'
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; CHECK-NEXT: - String: ' in favor of '
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; CHECK-NEXT: - OtherAccess: load
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 3, Column: 3 }
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; CHECK-NEXT: - String: ' because it is clobbered by '
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; CHECK-NEXT: - ClobberedBy: call
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; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 4, Column: 4 }
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; CHECK-NEXT: ...
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; More complex version of nonDominating1(), this time with loads. The values
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; already loaded into %0 and %1 cannot replace %2 due to clobbering calls.
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; %1 is not clobbered by the first call however, and %0 is irrelevant for the
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; second one since %1 is more recently available.
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define dso_local void @nonDominating2(i32* %a, i1 %cond) local_unnamed_addr #0 {
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entry:
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br i1 %cond, label %if.then, label %if.end5
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if.then: ; preds = %entry
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%0 = load i32, i32* %a, align 4, !dbg !14
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%mul = mul nsw i32 %0, 10
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tail call void @clobberingFunc() #1, !dbg !15
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%1 = load i32, i32* %a, align 4, !dbg !16
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%mul3 = mul nsw i32 %1, 5
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tail call void @clobberingFunc() #1, !dbg !17
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br label %if.end5
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if.end5: ; preds = %if.then, %entry
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%2 = load i32, i32* %a, align 4, !dbg !18
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%mul9 = shl nsw i32 %2, 1
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store i32 %mul9, i32* %a, align 4
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ret void
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}
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; CHECK: --- !Missed
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; CHECK-NEXT: Pass: gvn
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; CHECK-NEXT: Name: LoadClobbered
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; CHECK-NEXT: Function: nonDominating3
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; CHECK-NEXT: Args:
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; CHECK-NEXT: - String: 'load of type '
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; CHECK-NEXT: - Type: i32
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; CHECK-NEXT: - String: ' not eliminated'
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; CHECK-NEXT: - String: ' because it is clobbered by '
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; CHECK-NEXT: - ClobberedBy: call
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; CHECK-NEXT: ...
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; The two stores are both partially available at %0 (were it not for the
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; clobbering call), however neither is strictly more recent than the other, so
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; no attempt is made to identify what value could have potentially been reused
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; otherwise. Just report that the load cannot be eliminated.
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define dso_local void @nonDominating3(i32* %a, i32 %b, i32 %c, i1 %cond) local_unnamed_addr #0 {
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entry:
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br i1 %cond, label %if.end5.sink.split, label %if.else
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if.else: ; preds = %entry
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store i32 %b, i32* %a, align 4
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br label %if.end5
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if.end5.sink.split: ; preds = %entry
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store i32 %c, i32* %a, align 4
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br label %if.end5
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if.end5: ; preds = %if.end5.sink.split, %if.else
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tail call void @clobberingFunc() #1
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%0 = load i32, i32* %a, align 4
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%mul7 = shl nsw i32 %0, 1
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ret void
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}
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; CHECK: --- !Missed
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; CHECK-NEXT: Pass: gvn
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; CHECK-NEXT: Name: LoadClobbered
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; CHECK-NEXT: Function: nonDominating4
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; CHECK-NEXT: Args:
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; CHECK-NEXT: - String: 'load of type '
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; CHECK-NEXT: - Type: i32
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; CHECK-NEXT: - String: ' not eliminated'
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; CHECK-NEXT: - String: ' in favor of '
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; CHECK-NEXT: - OtherAccess: store
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; CHECK-NEXT: - String: ' because it is clobbered by '
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; CHECK-NEXT: - ClobberedBy: call
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; CHECK-NEXT: ...
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; Make sure isPotentiallyReachable() is not called for an instruction
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; outside the current function, as it will cause a crash.
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define dso_local void @nonDominating4(i1 %cond, i32 %b) local_unnamed_addr #0 {
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entry:
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br i1 %cond, label %if.then, label %if.end
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if.then: ; preds = %entry
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store i32 %b, i32* @g, align 4
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br label %if.end
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if.end: ; preds = %if.then, %entry
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tail call void @clobberingFunc() #1
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%0 = load i32, i32* @g, align 4
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%mul2 = shl nsw i32 %0, 1
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store i32 %mul2, i32* @g, align 4
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ret void
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}
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@g = external global i32
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define dso_local void @globalUser(i32 %b) local_unnamed_addr #0 {
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||||
entry:
|
||||
store i32 %b, i32* @g, align 4
|
||||
ret void
|
||||
}
|
||||
|
||||
attributes #0 = { "use-soft-float"="false" }
|
||||
attributes #1 = { nounwind }
|
||||
|
||||
!llvm.ident = !{!0}
|
||||
!llvm.dbg.cu = !{!1}
|
||||
!llvm.module.flags = !{!4, !5, !6}
|
||||
|
||||
!0 = !{!"clang version 10.0.0 (git@github.com:llvm/llvm-project.git a2f6ae9abffcba260c22bb235879f0576bf3b783)"}
|
||||
|
||||
!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang version 4.0.0 (trunk 282540) (llvm/trunk 282542)", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !3)
|
||||
!2 = !DIFile(filename: "/tmp/s.c", directory: "/tmp")
|
||||
!3 = !{}
|
||||
!4 = !{i32 2, !"Dwarf Version", i32 4}
|
||||
!5 = !{i32 2, !"Debug Info Version", i32 3}
|
||||
!6 = !{i32 1, !"PIC Level", i32 2}
|
||||
!8 = distinct !DISubprogram(name: "nonDominating2", scope: !2, file: !2, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !1, retainedNodes: !3)
|
||||
!9 = !DISubroutineType(types: !10)
|
||||
!10 = !{null, !11, !12, !12, !13}
|
||||
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
|
||||
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
!13 = !DIBasicType(name: "_Bool", size: 8, encoding: DW_ATE_boolean)
|
||||
!14 = !DILocation(line: 1, column: 1, scope: !8)
|
||||
!15 = !DILocation(line: 2, column: 2, scope: !8)
|
||||
!16 = !DILocation(line: 3, column: 3, scope: !8)
|
||||
!17 = !DILocation(line: 4, column: 4, scope: !8)
|
||||
!18 = !DILocation(line: 5, column: 5, scope: !8)
|
||||
Loading…
Reference in New Issue