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