| ; RUN: opt < %s -add-discriminators -sroa -S | FileCheck %s |
| |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| |
| ; Test case obtained from the following C code: |
| |
| ; struct A { |
| ; int field1; |
| ; short field2; |
| ; }; |
| ; |
| ; struct B { |
| ; struct A field1; |
| ; int field2; |
| ; }; |
| ; |
| ; |
| ; extern struct B g_b; |
| ; extern int bar(struct B b, int c); |
| ; |
| ; int foo(int cond) { |
| ; int result = cond ? bar(g_b, 33) : 42; |
| ; return result; |
| ; } |
| |
| ; In this test, global variable g_b is passed by copy to function bar. That |
| ; copy is located on the stack (see alloca %g_b.coerce), and it is initialized |
| ; by a memcpy call. |
| ; |
| ; SROA would split alloca %g_b.coerce into two (smaller disjoint) slices: |
| ; slice [0,8) and slice [8, 12). Users of the original alloca are rewritten |
| ; as users of the new alloca slices. |
| ; In particular, the memcpy is rewritten by SROA as two load/store pairs. |
| ; |
| ; Later on, mem2reg successfully promotes the new alloca slices to registers, |
| ; and loads %3 and %5 are made redundant by the loads obtained from the memcpy |
| ; intrinsic expansion. |
| ; |
| ; If pass AddDiscriminators doesn't assign a discriminator to the intrinsic |
| ; memcpy call, then the loads obtained from the memcpy expansion would not have |
| ; a correct discriminator. |
| ; |
| ; This test checks that the two new loads inserted by SROA in %cond.true |
| ; correctly reference a debug location with a non-zero discriminator. This test |
| ; also checks that the same discriminator is used by all instructions from |
| ; basic block %cond.true. |
| |
| %struct.B = type { %struct.A, i32 } |
| %struct.A = type { i32, i16 } |
| |
| @g_b = external global %struct.B, align 4 |
| |
| define i32 @foo(i32 %cond) #0 !dbg !5 { |
| entry: |
| %g_b.coerce = alloca { i64, i32 }, align 4 |
| %tobool = icmp ne i32 %cond, 0, !dbg !7 |
| br i1 %tobool, label %cond.true, label %cond.end, !dbg !7 |
| |
| cond.true: |
| ; CHECK-LABEL: cond.true: |
| ; CHECK: load i64, {{.*}}, !dbg ![[LOC:[0-9]+]] |
| ; CHECK-NEXT: load i32, {{.*}}, !dbg ![[LOC]] |
| ; CHECK-NEXT: %call = call i32 @bar({{.*}}), !dbg ![[LOC]] |
| ; CHECK-NEXT: br label %cond.end, !dbg ![[BR_LOC:[0-9]+]] |
| |
| ; CHECK-DAG: ![[LOC]] = !DILocation(line: 16, column: 23, scope: ![[SCOPE:[0-9]+]]) |
| ; CHECK-DAG: ![[SCOPE]] = !DILexicalBlockFile({{.*}}, discriminator: 2) |
| ; CHECK-DAG: ![[BR_LOC]] = !DILocation(line: 16, column: 16, scope: ![[SCOPE]]) |
| |
| %0 = bitcast { i64, i32 }* %g_b.coerce to i8*, !dbg !8 |
| %1 = bitcast %struct.B* @g_b to i8*, !dbg !8 |
| call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %0, i8* align 4 %1, i64 12, i1 false), !dbg !8 |
| %2 = getelementptr inbounds { i64, i32 }, { i64, i32 }* %g_b.coerce, i32 0, i32 0, !dbg !8 |
| %3 = load i64, i64* %2, align 4, !dbg !8 |
| %4 = getelementptr inbounds { i64, i32 }, { i64, i32 }* %g_b.coerce, i32 0, i32 1, !dbg !8 |
| %5 = load i32, i32* %4, align 4, !dbg !8 |
| %call = call i32 @bar(i64 %3, i32 %5, i32 33), !dbg !8 |
| br label %cond.end, !dbg !7 |
| |
| cond.end: ; preds = %entry, %cond.true |
| %cond1 = phi i32 [ %call, %cond.true ], [ 42, %entry ], !dbg !7 |
| ret i32 %cond1, !dbg !9 |
| } |
| |
| declare i32 @bar(i64, i32, i32) |
| |
| declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1) #1 |
| |
| attributes #0 = { noinline nounwind uwtable } |
| attributes #1 = { argmemonly nounwind } |
| |
| !llvm.dbg.cu = !{!0} |
| !llvm.module.flags = !{!3, !4} |
| |
| !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2) |
| !1 = !DIFile(filename: "test.c", directory: ".") |
| !2 = !{} |
| !3 = !{i32 2, !"Dwarf Version", i32 4} |
| !4 = !{i32 2, !"Debug Info Version", i32 3} |
| !5 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 15, type: !6, isLocal: false, isDefinition: true, scopeLine: 15, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) |
| !6 = !DISubroutineType(types: !2) |
| !7 = !DILocation(line: 16, column: 16, scope: !5) |
| !8 = !DILocation(line: 16, column: 23, scope: !5) |
| !9 = !DILocation(line: 17, column: 3, scope: !5) |