#include <stdint.h> #include <stdio.h> struct a { int16_t b; uint64_t c; } f = {1}; uint8_t d, h; static struct a *g[] = {&f, &f, &f, &f}; int32_t i; static struct a j(struct a *q) { for (d = 5; d < 6; d = d + 1) f.b = h; return *q; } int main() { struct a *l = g[3]; *l = j(l); i = f.b; printf("%d\n", i); } 

; ModuleID = 'test.c' source_filename = "test.c" target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128" target triple = "x86_64-unknown-linux-gnu" %struct.a = type { i16, i64 } @f = dso_local global %struct.a { i16 1, i64 0 }, align 8 @i = dso_local local_unnamed_addr global i32 0, align 4 @.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1 @d = dso_local local_unnamed_addr global i8 0, align 1 @h = dso_local local_unnamed_addr global i8 0, align 1 ; Function Attrs: nounwind uwtable define dso_local i32 @main() local_unnamed_addr #0 { entry: %tmp.sroa.4 = alloca [6 x i8], align 2 call void @llvm.lifetime.start.p0(i64 6, ptr nonnull %tmp.sroa.4) %call = call fastcc { i16, i64 } @j(ptr noundef nonnull @f) %0 = extractvalue { i16, i64 } %call, 0 %1 = extractvalue { i16, i64 } %call, 1 store i16 %0, ptr @f, align 8, !tbaa !5 call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 2 dereferenceable(6) getelementptr inbounds (i8, ptr @f, i64 2), ptr noundef nonnull align 2 dereferenceable(6) %tmp.sroa.4, i64 6, i1 false), !tbaa.struct !9 store i64 %1, ptr getelementptr inbounds (%struct.a, ptr @f, i64 0, i32 1), align 8, !tbaa !10 call void @llvm.lifetime.end.p0(i64 6, ptr nonnull %tmp.sroa.4) %conv = sext i16 %0 to i32 store i32 %conv, ptr @i, align 4, !tbaa !12 %call1 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %conv) ret i32 0 } ; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1 ; Function Attrs: nounwind uwtable define internal fastcc { i16, i64 } @j(ptr nocapture noundef readonly %q) unnamed_addr #0 { entry: br label %for.cond for.cond: ; preds = %for.body, %entry %storemerge = phi i8 [ 5, %entry ], [ %add, %for.body ] store i8 %storemerge, ptr @d, align 1, !tbaa !14 %cmp = icmp ult i8 %storemerge, 6 br i1 %cmp, label %for.body, label %for.end for.body: ; preds = %for.cond %0 = load i8, ptr @h, align 1, !tbaa !14 %conv2 = zext i8 %0 to i16 store i16 %conv2, ptr @f, align 8, !tbaa !15 %1 = load i8, ptr @d, align 1, !tbaa !14 %add = add i8 %1, 1 br label %for.cond, !llvm.loop !17 for.end: ; preds = %for.cond %retval.sroa.0.0.copyload = load i16, ptr %q, align 8, !tbaa !5 %retval.sroa.25.0.q.addr.0..sroa_idx = getelementptr inbounds i8, ptr %q, i64 8 %retval.sroa.25.0.copyload = load i64, ptr %retval.sroa.25.0.q.addr.0..sroa_idx, align 8, !tbaa !10 %.fca.0.insert = insertvalue { i16, i64 } poison, i16 %retval.sroa.0.0.copyload, 0 %.fca.1.insert = insertvalue { i16, i64 } %.fca.0.insert, i64 %retval.sroa.25.0.copyload, 1 ret { i16, i64 } %.fca.1.insert } ; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2 ; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1 ; Function Attrs: nofree nounwind declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3 attributes #0 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" } attributes #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) } attributes #2 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) } attributes #3 = { nofree nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" } !llvm.module.flags = !{!0, !1, !2, !3} !llvm.ident = !{!4} !0 = !{i32 1, !"wchar_size", i32 4} !1 = !{i32 8, !"PIC Level", i32 2} !2 = !{i32 7, !"PIE Level", i32 2} !3 = !{i32 7, !"uwtable", i32 2} !4 = !{!"clang version 19.0.0git"} !5 = !{!6, !6, i64 0} !6 = !{!"short", !7, i64 0} !7 = !{!"omnipotent char", !8, i64 0} !8 = !{!"Simple C/C++ TBAA"} !9 = !{i64 6, i64 8, !10} !10 = !{!11, !11, i64 0} !11 = !{!"long", !7, i64 0} !12 = !{!13, !13, i64 0} !13 = !{!"int", !7, i64 0} !14 = !{!7, !7, i64 0} !15 = !{!16, !6, i64 0} !16 = !{!"a", !6, i64 0, !11, i64 8} !17 = distinct !{!17, !18} !18 = !{!"llvm.loop.mustprogress"} 

; ModuleID = 'test.c' source_filename = "test.c" target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128" target triple = "x86_64-unknown-linux-gnu" %struct.a = type { i16, i64 } @f = dso_local global %struct.a { i16 1, i64 0 }, align 8 @i = dso_local local_unnamed_addr global i32 0, align 4 @.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1 @d = dso_local local_unnamed_addr global i8 0, align 1 @h = dso_local local_unnamed_addr global i8 0, align 1 ; Function Attrs: nounwind uwtable define dso_local i32 @main() local_unnamed_addr #0 { entry: %tmp.sroa.4 = alloca [6 x i8], align 2 call void @llvm.lifetime.start.p0(i64 6, ptr nonnull %tmp.sroa.4) %f.val = load i16, ptr @f, align 8 %0 = getelementptr i8, ptr @f, i64 8 %f.val4 = load i64, ptr %0, align 8 %call = call fastcc { i16, i64 } @j(i16 %f.val, i64 %f.val4) %1 = extractvalue { i16, i64 } %call, 0 %2 = extractvalue { i16, i64 } %call, 1 store i16 %1, ptr @f, align 8, !tbaa !5 call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 2 dereferenceable(6) getelementptr inbounds (i8, ptr @f, i64 2), ptr noundef nonnull align 2 dereferenceable(6) %tmp.sroa.4, i64 6, i1 false), !tbaa.struct !9 store i64 %2, ptr getelementptr inbounds (%struct.a, ptr @f, i64 0, i32 1), align 8, !tbaa !10 call void @llvm.lifetime.end.p0(i64 6, ptr nonnull %tmp.sroa.4) %conv = sext i16 %1 to i32 store i32 %conv, ptr @i, align 4, !tbaa !12 %call1 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %conv) ret i32 0 } ; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1 ; Function Attrs: nounwind uwtable define internal fastcc { i16, i64 } @j(i16 %q.0.val, i64 %q.8.val) unnamed_addr #0 { entry: br label %for.cond for.cond: ; preds = %for.body, %entry %storemerge = phi i8 [ 5, %entry ], [ %add, %for.body ] store i8 %storemerge, ptr @d, align 1, !tbaa !14 %cmp = icmp ult i8 %storemerge, 6 br i1 %cmp, label %for.body, label %for.end for.body: ; preds = %for.cond %0 = load i8, ptr @h, align 1, !tbaa !14 %conv2 = zext i8 %0 to i16 store i16 %conv2, ptr @f, align 8, !tbaa !15 %1 = load i8, ptr @d, align 1, !tbaa !14 %add = add i8 %1, 1 br label %for.cond, !llvm.loop !17 for.end: ; preds = %for.cond %.fca.0.insert = insertvalue { i16, i64 } poison, i16 %q.0.val, 0 %.fca.1.insert = insertvalue { i16, i64 } %.fca.0.insert, i64 %q.8.val, 1 ret { i16, i64 } %.fca.1.insert } ; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2 ; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1 ; Function Attrs: nofree nounwind declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3 attributes #0 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" } attributes #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) } attributes #2 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) } attributes #3 = { nofree nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" } !llvm.module.flags = !{!0, !1, !2, !3} !llvm.ident = !{!4} !0 = !{i32 1, !"wchar_size", i32 4} !1 = !{i32 8, !"PIC Level", i32 2} !2 = !{i32 7, !"PIE Level", i32 2} !3 = !{i32 7, !"uwtable", i32 2} !4 = !{!"clang version 19.0.0git"} !5 = !{!6, !6, i64 0} !6 = !{!"short", !7, i64 0} !7 = !{!"omnipotent char", !8, i64 0} !8 = !{!"Simple C/C++ TBAA"} !9 = !{i64 6, i64 8, !10} !10 = !{!11, !11, i64 0} !11 = !{!"long", !7, i64 0} !12 = !{!13, !13, i64 0} !13 = !{!"int", !7, i64 0} !14 = !{!7, !7, i64 0} !15 = !{!16, !6, i64 0} !16 = !{!"a", !6, i64 0, !11, i64 8} !17 = distinct !{!17, !18} !18 = !{!"llvm.loop.mustprogress"}