[llvm] r321138 - [memcpyopt] Teach memcpyopt to optimize across basic blocks
Dan Gohman via llvm-commits
llvm-commits at lists.llvm.org
Tue Dec 19 17:36:25 PST 2017
Author: djg
Date: Tue Dec 19 17:36:25 2017
New Revision: 321138
URL: http://llvm.org/viewvc/llvm-project?rev=321138&view=rev
Log:
[memcpyopt] Teach memcpyopt to optimize across basic blocks
This teaches memcpyopt to make a non-local memdep query when a local query
indicates that the dependency is non-local. This notably allows it to
eliminate many more llvm.memcpy calls in common Rust code, often by 20-30%.
This is r319482 and r319483, along with fixes for PR35519: fix the
optimization that merges stores into memsets to preserve cached memdep
info, and fix memdep's non-local caching strategy to not assume that larger
queries are always more conservative than smaller ones.
Fixes PR28958 and PR35519.
Differential Revision: https://reviews.llvm.org/D40802
Added:
llvm/trunk/test/Transforms/MemCpyOpt/memcpy-invoke-memcpy.ll
llvm/trunk/test/Transforms/MemCpyOpt/merge-into-memset.ll
llvm/trunk/test/Transforms/MemCpyOpt/mixed-sizes.ll
llvm/trunk/test/Transforms/MemCpyOpt/nonlocal-memcpy-memcpy.ll
Modified:
llvm/trunk/include/llvm/Analysis/MemoryDependenceAnalysis.h
llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp
llvm/trunk/lib/Transforms/Scalar/MemCpyOptimizer.cpp
Modified: llvm/trunk/include/llvm/Analysis/MemoryDependenceAnalysis.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Analysis/MemoryDependenceAnalysis.h?rev=321138&r1=321137&r2=321138&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Analysis/MemoryDependenceAnalysis.h (original)
+++ llvm/trunk/include/llvm/Analysis/MemoryDependenceAnalysis.h Tue Dec 19 17:36:25 2017
@@ -407,6 +407,12 @@ public:
void getNonLocalPointerDependency(Instruction *QueryInst,
SmallVectorImpl<NonLocalDepResult> &Result);
+ /// Perform a dependency query specifically for QueryInst's access to Loc.
+ /// The other comments for getNonLocalPointerDependency apply here as well.
+ void getNonLocalPointerDependencyFrom(Instruction *QueryInst,
+ const MemoryLocation &Loc, bool isLoad,
+ SmallVectorImpl<NonLocalDepResult> &Result);
+
/// Removes an instruction from the dependence analysis, updating the
/// dependence of instructions that previously depended on it.
void removeInstruction(Instruction *InstToRemove);
Modified: llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp?rev=321138&r1=321137&r2=321138&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp (original)
+++ llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp Tue Dec 19 17:36:25 2017
@@ -919,6 +919,14 @@ void MemoryDependenceResults::getNonLoca
Instruction *QueryInst, SmallVectorImpl<NonLocalDepResult> &Result) {
const MemoryLocation Loc = MemoryLocation::get(QueryInst);
bool isLoad = isa<LoadInst>(QueryInst);
+ return getNonLocalPointerDependencyFrom(QueryInst, Loc, isLoad, Result);
+}
+
+void MemoryDependenceResults::getNonLocalPointerDependencyFrom(
+ Instruction *QueryInst,
+ const MemoryLocation &Loc,
+ bool isLoad,
+ SmallVectorImpl<NonLocalDepResult> &Result) {
BasicBlock *FromBB = QueryInst->getParent();
assert(FromBB);
@@ -1118,21 +1126,15 @@ bool MemoryDependenceResults::getNonLoca
// If we already have a cache entry for this CacheKey, we may need to do some
// work to reconcile the cache entry and the current query.
if (!Pair.second) {
- if (CacheInfo->Size < Loc.Size) {
- // The query's Size is greater than the cached one. Throw out the
- // cached data and proceed with the query at the greater size.
+ if (CacheInfo->Size != Loc.Size) {
+ // The query's Size differs from the cached one. Throw out the
+ // cached data and proceed with the query at the new size.
CacheInfo->Pair = BBSkipFirstBlockPair();
CacheInfo->Size = Loc.Size;
for (auto &Entry : CacheInfo->NonLocalDeps)
if (Instruction *Inst = Entry.getResult().getInst())
RemoveFromReverseMap(ReverseNonLocalPtrDeps, Inst, CacheKey);
CacheInfo->NonLocalDeps.clear();
- } else if (CacheInfo->Size > Loc.Size) {
- // This query's Size is less than the cached one. Conservatively restart
- // the query using the greater size.
- return getNonLocalPointerDepFromBB(
- QueryInst, Pointer, Loc.getWithNewSize(CacheInfo->Size), isLoad,
- StartBB, Result, Visited, SkipFirstBlock);
}
// If the query's AATags are inconsistent with the cached one,
Modified: llvm/trunk/lib/Transforms/Scalar/MemCpyOptimizer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/MemCpyOptimizer.cpp?rev=321138&r1=321137&r2=321138&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/MemCpyOptimizer.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/MemCpyOptimizer.cpp Tue Dec 19 17:36:25 2017
@@ -476,22 +476,33 @@ Instruction *MemCpyOptPass::tryMergingIn
Alignment = DL.getABITypeAlignment(EltType);
}
- AMemSet =
- Builder.CreateMemSet(StartPtr, ByteVal, Range.End-Range.Start, Alignment);
+ // Remember the debug location.
+ DebugLoc Loc;
+ if (!Range.TheStores.empty())
+ Loc = Range.TheStores[0]->getDebugLoc();
DEBUG(dbgs() << "Replace stores:\n";
for (Instruction *SI : Range.TheStores)
- dbgs() << *SI << '\n';
- dbgs() << "With: " << *AMemSet << '\n');
-
- if (!Range.TheStores.empty())
- AMemSet->setDebugLoc(Range.TheStores[0]->getDebugLoc());
+ dbgs() << *SI << '\n');
// Zap all the stores.
for (Instruction *SI : Range.TheStores) {
MD->removeInstruction(SI);
SI->eraseFromParent();
}
+
+ // Create the memset after removing the stores, so that if there any cached
+ // non-local dependencies on the removed instructions in
+ // MemoryDependenceAnalysis, the cache entries are updated to "dirty"
+ // entries pointing below the memset, so subsequent queries include the
+ // memset.
+ AMemSet =
+ Builder.CreateMemSet(StartPtr, ByteVal, Range.End-Range.Start, Alignment);
+ if (!Range.TheStores.empty())
+ AMemSet->setDebugLoc(Loc);
+
+ DEBUG(dbgs() << "With: " << *AMemSet << '\n');
+
++NumMemSetInfer;
}
@@ -1031,9 +1042,22 @@ bool MemCpyOptPass::processMemCpyMemCpyD
//
// NOTE: This is conservative, it will stop on any read from the source loc,
// not just the defining memcpy.
- MemDepResult SourceDep =
- MD->getPointerDependencyFrom(MemoryLocation::getForSource(MDep), false,
- M->getIterator(), M->getParent());
+ MemoryLocation SourceLoc = MemoryLocation::getForSource(MDep);
+ MemDepResult SourceDep = MD->getPointerDependencyFrom(SourceLoc, false,
+ M->getIterator(), M->getParent());
+
+ if (SourceDep.isNonLocal()) {
+ SmallVector<NonLocalDepResult, 2> NonLocalDepResults;
+ MD->getNonLocalPointerDependencyFrom(M, SourceLoc, /*isLoad=*/false,
+ NonLocalDepResults);
+ if (NonLocalDepResults.size() == 1) {
+ SourceDep = NonLocalDepResults[0].getResult();
+ assert((!SourceDep.getInst() ||
+ LookupDomTree().dominates(SourceDep.getInst(), M)) &&
+ "when memdep returns exactly one result, it should dominate");
+ }
+ }
+
if (!SourceDep.isClobber() || SourceDep.getInst() != MDep)
return false;
@@ -1235,6 +1259,18 @@ bool MemCpyOptPass::processMemCpy(MemCpy
MemDepResult SrcDepInfo = MD->getPointerDependencyFrom(
SrcLoc, true, M->getIterator(), M->getParent());
+ if (SrcDepInfo.isNonLocal()) {
+ SmallVector<NonLocalDepResult, 2> NonLocalDepResults;
+ MD->getNonLocalPointerDependencyFrom(M, SrcLoc, /*isLoad=*/true,
+ NonLocalDepResults);
+ if (NonLocalDepResults.size() == 1) {
+ SrcDepInfo = NonLocalDepResults[0].getResult();
+ assert((!SrcDepInfo.getInst() ||
+ LookupDomTree().dominates(SrcDepInfo.getInst(), M)) &&
+ "when memdep returns exactly one result, it should dominate");
+ }
+ }
+
if (SrcDepInfo.isClobber()) {
if (MemCpyInst *MDep = dyn_cast<MemCpyInst>(SrcDepInfo.getInst()))
return processMemCpyMemCpyDependence(M, MDep);
Added: llvm/trunk/test/Transforms/MemCpyOpt/memcpy-invoke-memcpy.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/MemCpyOpt/memcpy-invoke-memcpy.ll?rev=321138&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/MemCpyOpt/memcpy-invoke-memcpy.ll (added)
+++ llvm/trunk/test/Transforms/MemCpyOpt/memcpy-invoke-memcpy.ll Tue Dec 19 17:36:25 2017
@@ -0,0 +1,48 @@
+; RUN: opt < %s -memcpyopt -S | FileCheck %s
+; Test memcpy-memcpy dependencies across invoke edges.
+
+; Test that memcpyopt works across the non-unwind edge of an invoke.
+
+define hidden void @test_normal(i8* noalias %dst, i8* %src) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+entry:
+ %temp = alloca i8, i32 64
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %temp, i8* nonnull %src, i64 64, i32 8, i1 false)
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %temp, i8* nonnull %src, i64 64, i32 8, i1 false)
+ invoke void @invoke_me()
+ to label %try.cont unwind label %lpad
+
+lpad:
+ landingpad { i8*, i32 }
+ catch i8* null
+ ret void
+
+try.cont:
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dst, i8* %temp, i64 64, i32 8, i1 false)
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dst, i8* %src, i64 64, i32 8, i1 false)
+ ret void
+}
+
+; Test that memcpyopt works across the unwind edge of an invoke.
+
+define hidden void @test_unwind(i8* noalias %dst, i8* %src) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+entry:
+ %temp = alloca i8, i32 64
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %temp, i8* nonnull %src, i64 64, i32 8, i1 false)
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %temp, i8* nonnull %src, i64 64, i32 8, i1 false)
+ invoke void @invoke_me()
+ to label %try.cont unwind label %lpad
+
+lpad:
+ landingpad { i8*, i32 }
+ catch i8* null
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dst, i8* %temp, i64 64, i32 8, i1 false)
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dst, i8* %src, i64 64, i32 8, i1 false)
+ ret void
+
+try.cont:
+ ret void
+}
+
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i32, i1)
+declare i32 @__gxx_personality_v0(...)
+declare void @invoke_me() readnone
Added: llvm/trunk/test/Transforms/MemCpyOpt/merge-into-memset.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/MemCpyOpt/merge-into-memset.ll?rev=321138&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/MemCpyOpt/merge-into-memset.ll (added)
+++ llvm/trunk/test/Transforms/MemCpyOpt/merge-into-memset.ll Tue Dec 19 17:36:25 2017
@@ -0,0 +1,45 @@
+; RUN: opt < %s -memcpyopt -S | FileCheck %s
+; Update cached non-local dependence information when merging stores into memset.
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+; Don't delete the memcpy in %if.then, even though it depends on an instruction
+; which will be deleted.
+
+; CHECK-LABEL: @foo
+define void @foo(i1 %c, i8* %d, i8* %e, i8* %f) {
+entry:
+ %tmp = alloca [50 x i8], align 8
+ %tmp4 = bitcast [50 x i8]* %tmp to i8*
+ %tmp1 = getelementptr inbounds i8, i8* %tmp4, i64 1
+ call void @llvm.memset.p0i8.i64(i8* nonnull %d, i8 0, i64 10, i32 1, i1 false), !dbg !5
+ store i8 0, i8* %tmp4, align 8, !dbg !5
+; CHECK: call void @llvm.memset.p0i8.i64(i8* nonnull %d, i8 0, i64 10, i32 1, i1 false), !dbg !5
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* nonnull %tmp1, i8* nonnull %d, i64 10, i32 1, i1 false)
+ br i1 %c, label %if.then, label %exit
+
+if.then:
+; CHECK: if.then:
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %f, i8* nonnull %tmp4, i64 30, i32 8, i1 false)
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %f, i8* nonnull %tmp4, i64 30, i32 8, i1 false)
+ br label %exit
+
+exit:
+ ret void
+}
+
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i32, i1)
+declare void @llvm.memset.p0i8.i64(i8*, i8, i64, i32, i1)
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_Rust, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "t.rs", directory: "/tmp")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !DILocation(line: 8, column: 5, scope: !6)
+!6 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 5, type: !7, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!7 = !DISubroutineType(types: !8)
+!8 = !{null}
Added: llvm/trunk/test/Transforms/MemCpyOpt/mixed-sizes.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/MemCpyOpt/mixed-sizes.ll?rev=321138&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/MemCpyOpt/mixed-sizes.ll (added)
+++ llvm/trunk/test/Transforms/MemCpyOpt/mixed-sizes.ll Tue Dec 19 17:36:25 2017
@@ -0,0 +1,36 @@
+; RUN: opt < %s -memcpyopt -S | FileCheck %s
+; Handle memcpy-memcpy dependencies of differing sizes correctly.
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+; Don't delete the second memcpy, even though there's an earlier
+; memcpy with a larger size from the same address.
+
+; CHECK-LABEL: @foo
+define i32 @foo(i1 %z) {
+entry:
+ %a = alloca [10 x i32]
+ %s = alloca [10 x i32]
+ %0 = bitcast [10 x i32]* %a to i8*
+ %1 = bitcast [10 x i32]* %s to i8*
+ call void @llvm.memset.p0i8.i64(i8* nonnull %1, i8 0, i64 40, i32 16, i1 false)
+ %arrayidx = getelementptr inbounds [10 x i32], [10 x i32]* %a, i64 0, i64 0
+ store i32 1, i32* %arrayidx
+ %scevgep = getelementptr [10 x i32], [10 x i32]* %s, i64 0, i64 1
+ %scevgep7 = bitcast i32* %scevgep to i8*
+ br i1 %z, label %for.body3.lr.ph, label %for.inc7.1
+
+for.body3.lr.ph: ; preds = %entry
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %scevgep7, i64 17179869180, i32 4, i1 false)
+ br label %for.inc7.1
+
+for.inc7.1:
+; CHECK: for.inc7.1:
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %scevgep7, i64 4, i32 4, i1 false)
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %scevgep7, i64 4, i32 4, i1 false)
+ %2 = load i32, i32* %arrayidx
+ ret i32 %2
+}
+
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i32, i1)
+declare void @llvm.memset.p0i8.i64(i8*, i8, i64, i32, i1)
Added: llvm/trunk/test/Transforms/MemCpyOpt/nonlocal-memcpy-memcpy.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/MemCpyOpt/nonlocal-memcpy-memcpy.ll?rev=321138&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/MemCpyOpt/nonlocal-memcpy-memcpy.ll (added)
+++ llvm/trunk/test/Transforms/MemCpyOpt/nonlocal-memcpy-memcpy.ll Tue Dec 19 17:36:25 2017
@@ -0,0 +1,114 @@
+; RUN: opt < %s -memcpyopt -S | FileCheck %s
+; Make sure memcpy-memcpy dependence is optimized across
+; basic blocks (conditional branches and invokes).
+
+%struct.s = type { i32, i32 }
+
+ at s_foo = private unnamed_addr constant %struct.s { i32 1, i32 2 }, align 4
+ at s_baz = private unnamed_addr constant %struct.s { i32 1, i32 2 }, align 4
+ at i = external constant i8*
+
+declare void @qux()
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i32, i1)
+declare void @__cxa_throw(i8*, i8*, i8*)
+declare i32 @__gxx_personality_v0(...)
+declare i8* @__cxa_begin_catch(i8*)
+
+; A simple partial redundancy. Test that the second memcpy is optimized
+; to copy directly from the original source rather than from the temporary.
+
+; CHECK-LABEL: @wobble
+define void @wobble(i8* noalias %dst, i8* %src, i1 %some_condition) {
+bb:
+ %temp = alloca i8, i32 64
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %temp, i8* nonnull %src, i64 64, i32 8, i1 false)
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %temp, i8* nonnull %src, i64 64, i32 8, i1 false)
+ br i1 %some_condition, label %more, label %out
+
+out:
+ call void @qux()
+ unreachable
+
+more:
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dst, i8* %temp, i64 64, i32 8, i1 false)
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dst, i8* %src, i64 64, i32 8, i1 false)
+ ret void
+}
+
+; A CFG triangle with a partial redundancy targeting an alloca. Test that the
+; memcpy inside the triangle is optimized to copy directly from the original
+; source rather than from the temporary.
+
+; CHECK-LABEL: @foo
+define i32 @foo(i1 %t3) {
+bb:
+ %s = alloca %struct.s, align 4
+ %t = alloca %struct.s, align 4
+ %s1 = bitcast %struct.s* %s to i8*
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %s1, i8* bitcast (%struct.s* @s_foo to i8*), i64 8, i32 4, i1 false)
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %s1, i8* bitcast (%struct.s* @s_foo to i8*), i64 8, i32 4, i1 false)
+ br i1 %t3, label %bb4, label %bb7
+
+bb4: ; preds = %bb
+ %t5 = bitcast %struct.s* %t to i8*
+ %s6 = bitcast %struct.s* %s to i8*
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %t5, i8* %s6, i64 8, i32 4, i1 false)
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %t5, i8* bitcast (%struct.s* @s_foo to i8*), i64 8, i32 4, i1 false)
+ br label %bb7
+
+bb7: ; preds = %bb4, %bb
+ %t8 = getelementptr %struct.s, %struct.s* %t, i32 0, i32 0
+ %t9 = load i32, i32* %t8, align 4
+ %t10 = getelementptr %struct.s, %struct.s* %t, i32 0, i32 1
+ %t11 = load i32, i32* %t10, align 4
+ %t12 = add i32 %t9, %t11
+ ret i32 %t12
+}
+
+; A CFG diamond with an invoke on one side, and a partially redundant memcpy
+; into an alloca on the other. Test that the memcpy inside the diamond is
+; optimized to copy ; directly from the original source rather than from the
+; temporary. This more complex test represents a relatively common usage
+; pattern.
+
+; CHECK-LABEL: @baz
+define i32 @baz(i1 %t5) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+bb:
+ %s = alloca %struct.s, align 4
+ %t = alloca %struct.s, align 4
+ %s3 = bitcast %struct.s* %s to i8*
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %s3, i8* bitcast (%struct.s* @s_baz to i8*), i64 8, i32 4, i1 false)
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %s3, i8* bitcast (%struct.s* @s_baz to i8*), i64 8, i32 4, i1 false)
+ br i1 %t5, label %bb6, label %bb22
+
+bb6: ; preds = %bb
+ invoke void @__cxa_throw(i8* null, i8* bitcast (i8** @i to i8*), i8* null)
+ to label %bb25 unwind label %bb9
+
+bb9: ; preds = %bb6
+ %t10 = landingpad { i8*, i32 }
+ catch i8* null
+ br label %bb13
+
+bb13: ; preds = %bb9
+ %t15 = call i8* @__cxa_begin_catch(i8* null)
+ br label %bb23
+
+bb22: ; preds = %bb
+ %t23 = bitcast %struct.s* %t to i8*
+ %s24 = bitcast %struct.s* %s to i8*
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %t23, i8* %s24, i64 8, i32 4, i1 false)
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %t23, i8* bitcast (%struct.s* @s_baz to i8*), i64 8, i32 4, i1 false)
+ br label %bb23
+
+bb23: ; preds = %bb22, %bb13
+ %t17 = getelementptr inbounds %struct.s, %struct.s* %t, i32 0, i32 0
+ %t18 = load i32, i32* %t17, align 4
+ %t19 = getelementptr inbounds %struct.s, %struct.s* %t, i32 0, i32 1
+ %t20 = load i32, i32* %t19, align 4
+ %t21 = add nsw i32 %t18, %t20
+ ret i32 %t21
+
+bb25: ; preds = %bb6
+ unreachable
+}
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