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[MergeICmps] Disable mergeicmps if the target does not want to handle memcmp expansion.
Summary: This is to avoid e.g. merging two cheap icmps if the target is not going to expand to something nice later. Reviewers: dberlin, spatel Subscribers: davide, nemanjai Differential Revision: https://reviews.llvm.org/D38232 llvm-svn: 314970
This commit is contained in:
Clement Courbet
parent
4c352af309
commit
18754ff013
@ -28,6 +28,8 @@
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#include <vector>
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#include "llvm/ADT/APSInt.h"
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#include "llvm/Analysis/Loads.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/IntrinsicInst.h"
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@ -41,8 +43,6 @@ namespace {
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#define DEBUG_TYPE "mergeicmps"
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#define MERGEICMPS_DOT_ON
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// A BCE atom.
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struct BCEAtom {
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BCEAtom() : GEP(nullptr), LoadI(nullptr), Offset() {}
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@ -589,22 +589,30 @@ class MergeICmps : public FunctionPass {
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bool runOnFunction(Function &F) override {
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if (skipFunction(F)) return false;
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const auto &TLI = getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
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auto PA = runImpl(F, &TLI);
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const auto &TTI = getAnalysis<TargetTransformInfoWrapperPass>().getTTI(F);
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auto PA = runImpl(F, &TLI, &TTI);
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return !PA.areAllPreserved();
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}
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private:
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<TargetLibraryInfoWrapperPass>();
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AU.addRequired<TargetTransformInfoWrapperPass>();
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}
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PreservedAnalyses runImpl(Function &F, const TargetLibraryInfo *TLI);
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PreservedAnalyses runImpl(Function &F, const TargetLibraryInfo *TLI,
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const TargetTransformInfo *TTI);
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};
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PreservedAnalyses MergeICmps::runImpl(Function &F,
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const TargetLibraryInfo *TLI) {
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PreservedAnalyses MergeICmps::runImpl(Function &F, const TargetLibraryInfo *TLI,
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const TargetTransformInfo *TTI) {
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DEBUG(dbgs() << "MergeICmpsPass: " << F.getName() << "\n");
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// We only try merging comparisons if the target wants to expand memcmp later.
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// The rationale is to avoid turning small chains into memcmp calls.
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unsigned MaxLoadSize;
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if (!TTI->enableMemCmpExpansion(MaxLoadSize)) return PreservedAnalyses::all();
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bool MadeChange = false;
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for (auto BBIt = ++F.begin(); BBIt != F.end(); ++BBIt) {
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@ -623,6 +631,7 @@ char MergeICmps::ID = 0;
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INITIALIZE_PASS_BEGIN(MergeICmps, "mergeicmps",
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"Merge contiguous icmps into a memcmp", false, false)
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INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
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INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
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INITIALIZE_PASS_END(MergeICmps, "mergeicmps",
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"Merge contiguous icmps into a memcmp", false, false)
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3
test/Transforms/MergeICmps/X86/lit.local.cfg
Normal file
3
test/Transforms/MergeICmps/X86/lit.local.cfg
Normal file
@ -0,0 +1,3 @@
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if not 'X86' in config.root.targets:
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config.unsupported = True
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91
test/Transforms/MergeICmps/X86/pair-int32-int32.ll
Normal file
91
test/Transforms/MergeICmps/X86/pair-int32-int32.ll
Normal file
@ -0,0 +1,91 @@
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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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%"struct.std::pair" = type { i32, i32 }
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define zeroext i1 @opeq1(
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; X86-LABEL: @opeq1(
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; X86-NEXT: entry:
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; X86-NEXT: [[FIRST_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[A:%.*]], i64 0, i32 0
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; X86-NEXT: [[FIRST1_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[B:%.*]], i64 0, i32 0
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; X86-NEXT: [[CSTR:%.*]] = bitcast i32* [[FIRST_I]] to i8*
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; X86-NEXT: [[CSTR1:%.*]] = bitcast i32* [[FIRST1_I]] to i8*
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; X86-NEXT: [[MEMCMP:%.*]] = call i32 @memcmp(i8* [[CSTR]], i8* [[CSTR1]], i64 8)
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; X86-NEXT: [[TMP0:%.*]] = icmp eq i32 [[MEMCMP]], 0
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; X86-NEXT: br label [[OPEQ1_EXIT:%.*]]
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; X86: opeq1.exit:
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; X86-NEXT: [[TMP1:%.*]] = phi i1 [ [[TMP0]], [[ENTRY:%.*]] ]
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; X86-NEXT: ret i1 [[TMP1]]
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;
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%"struct.std::pair"* nocapture readonly dereferenceable(8) %a,
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%"struct.std::pair"* nocapture readonly dereferenceable(8) %b) local_unnamed_addr #0 {
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entry:
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%first.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %a, i64 0, i32 0
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%0 = load i32, i32* %first.i, align 4
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%first1.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %b, i64 0, i32 0
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%1 = load i32, i32* %first1.i, align 4
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%cmp.i = icmp eq i32 %0, %1
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br i1 %cmp.i, label %land.rhs.i, label %opeq1.exit
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land.rhs.i:
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%second.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %a, i64 0, i32 1
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%2 = load i32, i32* %second.i, align 4
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%second2.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %b, i64 0, i32 1
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%3 = load i32, i32* %second2.i, align 4
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%cmp3.i = icmp eq i32 %2, %3
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br label %opeq1.exit
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opeq1.exit:
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%4 = phi i1 [ false, %entry ], [ %cmp3.i, %land.rhs.i ]
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ret i1 %4
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; The entry block with zero-offset GEPs is kept, loads are removed.
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; The two 4 byte loads and compares are replaced with a single 8-byte memcmp.
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; The branch is now a direct branch; the other block has been removed.
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; The phi is updated.
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}
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; Same as above, but the two blocks are in inverse order.
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define zeroext i1 @opeq1_inverse(
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; X86-LABEL: @opeq1_inverse(
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; X86-NEXT: land.rhs.i:
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; X86-NEXT: [[SECOND_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[A:%.*]], i64 0, i32 0
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; X86-NEXT: [[SECOND2_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[B:%.*]], i64 0, i32 0
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; X86-NEXT: [[CSTR:%.*]] = bitcast i32* [[SECOND_I]] to i8*
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; X86-NEXT: [[CSTR1:%.*]] = bitcast i32* [[SECOND2_I]] to i8*
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; X86-NEXT: [[MEMCMP:%.*]] = call i32 @memcmp(i8* [[CSTR]], i8* [[CSTR1]], i64 8)
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; X86-NEXT: [[TMP0:%.*]] = icmp eq i32 [[MEMCMP]], 0
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; X86-NEXT: br label [[OPEQ1_EXIT:%.*]]
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; X86: opeq1.exit:
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; X86-NEXT: [[TMP1:%.*]] = phi i1 [ [[TMP0]], [[LAND_RHS_I:%.*]] ]
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; X86-NEXT: ret i1 [[TMP1]]
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;
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%"struct.std::pair"* nocapture readonly dereferenceable(8) %a,
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%"struct.std::pair"* nocapture readonly dereferenceable(8) %b) local_unnamed_addr #0 {
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entry:
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%first.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %a, i64 0, i32 1
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%0 = load i32, i32* %first.i, align 4
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%first1.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %b, i64 0, i32 1
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%1 = load i32, i32* %first1.i, align 4
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%cmp.i = icmp eq i32 %0, %1
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br i1 %cmp.i, label %land.rhs.i, label %opeq1.exit
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land.rhs.i:
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%second.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %a, i64 0, i32 0
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%2 = load i32, i32* %second.i, align 4
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%second2.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %b, i64 0, i32 0
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%3 = load i32, i32* %second2.i, align 4
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%cmp3.i = icmp eq i32 %2, %3
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br label %opeq1.exit
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opeq1.exit:
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%4 = phi i1 [ false, %entry ], [ %cmp3.i, %land.rhs.i ]
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ret i1 %4
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; The second block with zero-offset GEPs is kept, loads are removed.
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; CHECK: land.rhs.i
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; The two 4 byte loads and compares are replaced with a single 8-byte memcmp.
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; The branch is now a direct branch; the other block has been removed.
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; The phi is updated.
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}
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@ -1,4 +1,5 @@
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; RUN: opt -mergeicmps -S -o - %s | FileCheck %s
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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
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; This is a more involved test: clang generates this weird pattern for
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; tuple<uint8_t, uint8_t, uint8_t, uint8_t>. Right now we skip the entry block
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@ -17,6 +18,31 @@
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%"struct.std::_Head_base.6" = type { i8 }
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define zeroext i1 @opeq(
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; CHECK-LABEL: @opeq(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = getelementptr inbounds %"class.std::tuple", %"class.std::tuple"* [[A:%.*]], i64 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0
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; CHECK-NEXT: [[ADD_PTR_I_I_I_I_I:%.*]] = getelementptr inbounds i8, i8* [[TMP0]], i64 3
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; CHECK-NEXT: [[TMP1:%.*]] = load i8, i8* [[ADD_PTR_I_I_I_I_I]], align 1
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; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds %"class.std::tuple", %"class.std::tuple"* [[B:%.*]], i64 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0
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; CHECK-NEXT: [[ADD_PTR_I_I_I6_I_I:%.*]] = getelementptr inbounds i8, i8* [[TMP2]], i64 3
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; CHECK-NEXT: [[TMP3:%.*]] = load i8, i8* [[ADD_PTR_I_I_I6_I_I]], align 1
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; CHECK-NEXT: [[CMP_I_I:%.*]] = icmp eq i8 [[TMP1]], [[TMP3]]
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; CHECK-NEXT: br i1 [[CMP_I_I]], label [[LAND_RHS_I_I_I_I:%.*]], label [[OPEQ_EXIT:%.*]]
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; CHECK: land.rhs.i.i.i:
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; CHECK-NEXT: [[ADD_PTR_I_I_I_I_I_I_I:%.*]] = getelementptr inbounds i8, i8* [[TMP0]], i64 1
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; CHECK-NEXT: [[ADD_PTR_I_I_I6_I_I_I_I:%.*]] = getelementptr inbounds i8, i8* [[TMP2]], i64 1
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; CHECK-NEXT: [[MEMCMP:%.*]] = call i32 @memcmp(i8* [[ADD_PTR_I_I_I6_I_I_I_I]], i8* [[ADD_PTR_I_I_I_I_I_I_I]], i64 2)
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; CHECK-NEXT: [[TMP4:%.*]] = icmp eq i32 [[MEMCMP]], 0
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; CHECK-NEXT: br label [[OPEQ_EXIT]]
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; CHECK: land.rhs.i.i.i.i:
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; CHECK-NEXT: [[TMP5:%.*]] = load i8, i8* [[TMP0]], align 1
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; CHECK-NEXT: [[TMP6:%.*]] = load i8, i8* [[TMP2]], align 1
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; CHECK-NEXT: [[CMP_I_I_I_I_I:%.*]] = icmp eq i8 [[TMP5]], [[TMP6]]
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; CHECK-NEXT: br i1 [[CMP_I_I_I_I_I]], label [[LAND_RHS_I_I_I:%.*]], label [[OPEQ_EXIT]]
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; CHECK: opeq.exit:
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; CHECK-NEXT: [[TMP7:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[CMP_I_I_I_I_I]], [[LAND_RHS_I_I_I_I]] ], [ [[TMP4]], [[LAND_RHS_I_I_I]] ]
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; CHECK-NEXT: ret i1 [[TMP7]]
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;
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%"class.std::tuple"* nocapture readonly dereferenceable(4) %a,
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%"class.std::tuple"* nocapture readonly dereferenceable(4) %b) local_unnamed_addr #1 {
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entry:
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@ -54,18 +80,11 @@ land.rhs.i.i.i.i:
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opeq.exit:
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%10 = phi i1 [ false, %entry ], [ false, %land.rhs.i.i ], [ false, %land.rhs.i.i.i ], [ %cmp.i.i.i.i.i, %land.rhs.i.i.i.i ]
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ret i1 %10
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; CHECK-LABEL: @opeq(
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; The entry block is kept as is, but the next block is now the merged comparison
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; block for bytes [1,2] or the block for the head.
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; CHECK: entry
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; CHECK: br i1 %cmp.i.i, label %land.rhs.i.i.i{{(.i)?}}, label %opeq.exit
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; The two 1 byte loads and compares at offset 1 are replaced with a single
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; 2-byte memcmp.
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; CHECK: land.rhs.i.i.i
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; CHECK: @memcmp({{.*}}2)
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; CHECK: icmp eq {{.*}} 0
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; In the end we have three blocks.
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; CHECK: phi i1
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; CHECK-SAME %entry
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; CHECK-SAME %land.rhs.i.i.i.i
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; CHECK-SAME %land.rhs.i.i.i
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48
test/Transforms/MergeICmps/X86/volatile.ll
Normal file
48
test/Transforms/MergeICmps/X86/volatile.ll
Normal file
@ -0,0 +1,48 @@
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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
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%"struct.std::pair" = type { i32, i32 }
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define zeroext i1 @opeq(
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; CHECK-LABEL: @opeq(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[FIRST_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[A:%.*]], i64 0, i32 0
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; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* [[FIRST_I]], align 4
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; CHECK-NEXT: [[FIRST1_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[B:%.*]], i64 0, i32 0
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; CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* [[FIRST1_I]], align 4
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; CHECK-NEXT: [[CMP_I:%.*]] = icmp eq i32 [[TMP0]], [[TMP1]]
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; CHECK-NEXT: br i1 [[CMP_I]], label [[LAND_RHS_I:%.*]], label [[OPEQ1_EXIT:%.*]]
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; CHECK: land.rhs.i:
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; CHECK-NEXT: [[SECOND_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[A]], i64 0, i32 1
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; CHECK-NEXT: [[TMP2:%.*]] = load volatile i32, i32* [[SECOND_I]], align 4
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; CHECK-NEXT: [[SECOND2_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[B]], i64 0, i32 1
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; CHECK-NEXT: [[TMP3:%.*]] = load i32, i32* [[SECOND2_I]], align 4
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; CHECK-NEXT: [[CMP3_I:%.*]] = icmp eq i32 [[TMP2]], [[TMP3]]
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; CHECK-NEXT: br label [[OPEQ1_EXIT]]
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; CHECK: opeq1.exit:
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; CHECK-NEXT: [[TMP4:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[CMP3_I]], [[LAND_RHS_I]] ]
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; CHECK-NEXT: ret i1 [[TMP4]]
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;
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%"struct.std::pair"* nocapture readonly dereferenceable(8) %a,
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%"struct.std::pair"* nocapture readonly dereferenceable(8) %b) local_unnamed_addr #0 {
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entry:
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%first.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %a, i64 0, i32 0
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%0 = load i32, i32* %first.i, align 4
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%first1.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %b, i64 0, i32 0
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%1 = load i32, i32* %first1.i, align 4
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%cmp.i = icmp eq i32 %0, %1
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br i1 %cmp.i, label %land.rhs.i, label %opeq1.exit
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land.rhs.i:
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%second.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %a, i64 0, i32 1
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%2 = load volatile i32, i32* %second.i, align 4
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%second2.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %b, i64 0, i32 1
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%3 = load i32, i32* %second2.i, align 4
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%cmp3.i = icmp eq i32 %2, %3
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br label %opeq1.exit
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opeq1.exit:
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%4 = phi i1 [ false, %entry ], [ %cmp3.i, %land.rhs.i ]
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ret i1 %4
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}
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@ -1,8 +1,28 @@
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; RUN: opt -mergeicmps -S -o - %s | FileCheck %s
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -mergeicmps -S | FileCheck %s --check-prefix=NOEXPANSION
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%"struct.std::pair" = type { i32, i32 }
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define zeroext i1 @opeq1(
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; NOEXPANSION-LABEL: @opeq1(
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; NOEXPANSION-NEXT: entry:
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; NOEXPANSION-NEXT: [[FIRST_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[A:%.*]], i64 0, i32 0
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; NOEXPANSION-NEXT: [[TMP0:%.*]] = load i32, i32* [[FIRST_I]], align 4
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; NOEXPANSION-NEXT: [[FIRST1_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[B:%.*]], i64 0, i32 0
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; NOEXPANSION-NEXT: [[TMP1:%.*]] = load i32, i32* [[FIRST1_I]], align 4
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; NOEXPANSION-NEXT: [[CMP_I:%.*]] = icmp eq i32 [[TMP0]], [[TMP1]]
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; NOEXPANSION-NEXT: br i1 [[CMP_I]], label [[LAND_RHS_I:%.*]], label [[OPEQ1_EXIT:%.*]]
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; NOEXPANSION: land.rhs.i:
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; NOEXPANSION-NEXT: [[SECOND_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[A]], i64 0, i32 1
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; NOEXPANSION-NEXT: [[TMP2:%.*]] = load i32, i32* [[SECOND_I]], align 4
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; NOEXPANSION-NEXT: [[SECOND2_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[B]], i64 0, i32 1
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; NOEXPANSION-NEXT: [[TMP3:%.*]] = load i32, i32* [[SECOND2_I]], align 4
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; NOEXPANSION-NEXT: [[CMP3_I:%.*]] = icmp eq i32 [[TMP2]], [[TMP3]]
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; NOEXPANSION-NEXT: br label [[OPEQ1_EXIT]]
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||||
; NOEXPANSION: opeq1.exit:
|
||||
; NOEXPANSION-NEXT: [[TMP4:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[CMP3_I]], [[LAND_RHS_I]] ]
|
||||
; NOEXPANSION-NEXT: ret i1 [[TMP4]]
|
||||
;
|
||||
%"struct.std::pair"* nocapture readonly dereferenceable(8) %a,
|
||||
%"struct.std::pair"* nocapture readonly dereferenceable(8) %b) local_unnamed_addr #0 {
|
||||
entry:
|
||||
@ -24,26 +44,29 @@ land.rhs.i:
|
||||
opeq1.exit:
|
||||
%4 = phi i1 [ false, %entry ], [ %cmp3.i, %land.rhs.i ]
|
||||
ret i1 %4
|
||||
; CHECK-LABEL: @opeq1(
|
||||
; The entry block with zero-offset GEPs is kept, loads are removed.
|
||||
; CHECK: entry
|
||||
; CHECK: getelementptr {{.*}} i32 0
|
||||
; CHECK-NOT: load
|
||||
; CHECK: getelementptr {{.*}} i32 0
|
||||
; CHECK-NOT: load
|
||||
; The two 4 byte loads and compares are replaced with a single 8-byte memcmp.
|
||||
; CHECK: @memcmp({{.*}}8)
|
||||
; CHECK: icmp eq {{.*}} 0
|
||||
; The branch is now a direct branch; the other block has been removed.
|
||||
; CHECK: br label %opeq1.exit
|
||||
; CHECK-NOT: br
|
||||
; The phi is updated.
|
||||
; CHECK: phi i1 [ %{{[^,]*}}, %entry ]
|
||||
; CHECK-NEXT: ret
|
||||
}
|
||||
|
||||
; Same as above, but the two blocks are in inverse order.
|
||||
define zeroext i1 @opeq1_inverse(
|
||||
; NOEXPANSION-LABEL: @opeq1_inverse(
|
||||
; NOEXPANSION-NEXT: entry:
|
||||
; NOEXPANSION-NEXT: [[FIRST_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[A:%.*]], i64 0, i32 1
|
||||
; NOEXPANSION-NEXT: [[TMP0:%.*]] = load i32, i32* [[FIRST_I]], align 4
|
||||
; NOEXPANSION-NEXT: [[FIRST1_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[B:%.*]], i64 0, i32 1
|
||||
; NOEXPANSION-NEXT: [[TMP1:%.*]] = load i32, i32* [[FIRST1_I]], align 4
|
||||
; NOEXPANSION-NEXT: [[CMP_I:%.*]] = icmp eq i32 [[TMP0]], [[TMP1]]
|
||||
; NOEXPANSION-NEXT: br i1 [[CMP_I]], label [[LAND_RHS_I:%.*]], label [[OPEQ1_EXIT:%.*]]
|
||||
; NOEXPANSION: land.rhs.i:
|
||||
; NOEXPANSION-NEXT: [[SECOND_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[A]], i64 0, i32 0
|
||||
; NOEXPANSION-NEXT: [[TMP2:%.*]] = load i32, i32* [[SECOND_I]], align 4
|
||||
; NOEXPANSION-NEXT: [[SECOND2_I:%.*]] = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* [[B]], i64 0, i32 0
|
||||
; NOEXPANSION-NEXT: [[TMP3:%.*]] = load i32, i32* [[SECOND2_I]], align 4
|
||||
; NOEXPANSION-NEXT: [[CMP3_I:%.*]] = icmp eq i32 [[TMP2]], [[TMP3]]
|
||||
; NOEXPANSION-NEXT: br label [[OPEQ1_EXIT]]
|
||||
; NOEXPANSION: opeq1.exit:
|
||||
; NOEXPANSION-NEXT: [[TMP4:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[CMP3_I]], [[LAND_RHS_I]] ]
|
||||
; NOEXPANSION-NEXT: ret i1 [[TMP4]]
|
||||
;
|
||||
%"struct.std::pair"* nocapture readonly dereferenceable(8) %a,
|
||||
%"struct.std::pair"* nocapture readonly dereferenceable(8) %b) local_unnamed_addr #0 {
|
||||
entry:
|
||||
@ -65,22 +88,6 @@ land.rhs.i:
|
||||
opeq1.exit:
|
||||
%4 = phi i1 [ false, %entry ], [ %cmp3.i, %land.rhs.i ]
|
||||
ret i1 %4
|
||||
; CHECK-LABEL: @opeq1_inverse(
|
||||
; The second block with zero-offset GEPs is kept, loads are removed.
|
||||
; CHECK: land.rhs.i
|
||||
; CHECK: getelementptr {{.*}} i32 0
|
||||
; CHECK-NOT: load
|
||||
; CHECK: getelementptr {{.*}} i32 0
|
||||
; CHECK-NOT: load
|
||||
; The two 4 byte loads and compares are replaced with a single 8-byte memcmp.
|
||||
; CHECK: @memcmp({{.*}}8)
|
||||
; CHECK: icmp eq {{.*}} 0
|
||||
; The branch is now a direct branch; the other block has been removed.
|
||||
; CHECK: br label %opeq1.exit
|
||||
; CHECK-NOT: br
|
||||
; The phi is updated.
|
||||
; CHECK: phi i1 [ %{{[^,]*}}, %land.rhs.i ]
|
||||
; CHECK-NEXT: ret
|
||||
}
|
||||
|
||||
|
||||
|
||||
@ -1,30 +0,0 @@
|
||||
; RUN: opt -mergeicmps -S -o - %s | FileCheck %s
|
||||
|
||||
%"struct.std::pair" = type { i32, i32 }
|
||||
|
||||
define zeroext i1 @opeq(
|
||||
%"struct.std::pair"* nocapture readonly dereferenceable(8) %a,
|
||||
%"struct.std::pair"* nocapture readonly dereferenceable(8) %b) local_unnamed_addr #0 {
|
||||
entry:
|
||||
%first.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %a, i64 0, i32 0
|
||||
%0 = load i32, i32* %first.i, align 4
|
||||
%first1.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %b, i64 0, i32 0
|
||||
%1 = load i32, i32* %first1.i, align 4
|
||||
%cmp.i = icmp eq i32 %0, %1
|
||||
br i1 %cmp.i, label %land.rhs.i, label %opeq1.exit
|
||||
|
||||
land.rhs.i:
|
||||
%second.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %a, i64 0, i32 1
|
||||
%2 = load volatile i32, i32* %second.i, align 4
|
||||
%second2.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %b, i64 0, i32 1
|
||||
%3 = load i32, i32* %second2.i, align 4
|
||||
%cmp3.i = icmp eq i32 %2, %3
|
||||
br label %opeq1.exit
|
||||
|
||||
opeq1.exit:
|
||||
%4 = phi i1 [ false, %entry ], [ %cmp3.i, %land.rhs.i ]
|
||||
ret i1 %4
|
||||
; CHECK-LABEL: @opeq(
|
||||
; CHECK-NOT: memcmp
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user