238 lines
8.3 KiB
Plaintext
238 lines
8.3 KiB
Plaintext
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# RUN: llc -mtriple=x86_64-unknown-unknown -run-pass=machine-sink -o - %s | FileCheck %s
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# In the first test, check various things when we sink machine instructions:
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# a) DBG_VALUEs should sink with defs
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# b) Undefs should be left behind
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# c) DBG_VALUEs not immediately following the defining inst should sink too
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# d) If we generate debug-use-before-defs through sinking, and can copy
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# propagate to a different value, we should do that.
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#
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# Test two checks DBG_VALUEs do not sink past a DBG_VALUE in the same block
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# that redefines the variable location, while three checks that copy-propagation
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# happens in the same scenario.
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--- |
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@x = common local_unnamed_addr global i32 0, align 4, !dbg !0
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; Function Attrs: noreturn nounwind uwtable
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define void @Process(i32* nocapture readonly %p) local_unnamed_addr !dbg !9 {
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; Stripped
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entry:
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br label %nou
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nou:
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br label %exit
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exit:
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ret void
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}
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define void @test2(i32* nocapture readonly %p) local_unnamed_addr !dbg !101 {
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; Stripped
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entry:
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br label %block1
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block1:
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br label %exit
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exit:
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ret void
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}
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define void @test3(i32* nocapture readonly %p) local_unnamed_addr !dbg !201 {
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; Stripped
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entry:
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br label %block1
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block1:
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br label %exit
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exit:
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ret void
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
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!llvm.dbg.cu = !{!1}
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!llvm.module.flags = !{!6, !7}
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!llvm.ident = !{!8}
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!0 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "x", scope: !1, file: !2, line: 1, type: !5, isLocal: false, isDefinition: true), expr: !DIExpression())
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!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !4)
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!2 = !DIFile(filename: "t.c", directory: "")
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!3 = !{}
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!4 = !{!0}
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!5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!6 = !{i32 2, !"Dwarf Version", i32 4}
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!7 = !{i32 2, !"Debug Info Version", i32 3}
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!8 = !{!"clang version 4.0.0 "}
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!9 = distinct !DISubprogram(name: "Process", scope: !2, file: !2, line: 2, type: !10, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !1, retainedNodes: !15)
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!10 = !DISubroutineType(types: !11)
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!11 = !{null, !12}
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
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!13 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !14)
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!14 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!15 = !{!16}
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!16 = !DILocalVariable(name: "p", arg: 1, scope: !9, file: !2, line: 2, type: !12)
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!17 = !DIExpression()
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!18 = !DILocation(line: 2, column: 34, scope: !9)
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!28 = !DILexicalBlockFile(scope: !9, file: !2, discriminator: 1)
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!101 = distinct !DISubprogram(name: "test2", scope: !2, file: !2, line: 2, type: !10, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !1, retainedNodes: !102)
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!102 = !{!103}
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!103 = !DILocalVariable(name: "q", arg: 1, scope: !101, file: !2, line: 2, type: !12)
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!104 = !DILocation(line: 1, column: 1, scope: !101)
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!201 = distinct !DISubprogram(name: "test2", scope: !2, file: !2, line: 2, type: !10, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !1, retainedNodes: !202)
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!202 = !{!203}
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!203 = !DILocalVariable(name: "r", arg: 1, scope: !201, file: !2, line: 2, type: !12)
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!204 = !DILocation(line: 1, column: 1, scope: !201)
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; CHECK: [[VARNUM:![0-9]+]] = !DILocalVariable(name: "p",
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; CHECK: [[VAR2NUM:![0-9]+]] = !DILocalVariable(name: "q",
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; CHECK: [[VAR3NUM:![0-9]+]] = !DILocalVariable(name: "r",
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...
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---
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name: Process
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tracksRegLiveness: true
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liveins:
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- { reg: '$rdi', virtual-reg: '%2' }
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- { reg: '$rsi', virtual-reg: '%2' }
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body: |
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bb.0.entry:
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successors: %bb.1.nou(0x80000000), %bb.2.exit
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liveins: $rdi, $esi
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; This block should have the vreg copy sunk from it, the DBG_VALUE with it,
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; and a copy-prop'd DBG_VALUE left over.
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; CHECK-LABEL: bb.0.entry:
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; CHECK: [[ARG0VREG:%[0-9]+]]:gr64 = COPY $rdi
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; CHECK-NEXT: CMP32ri $esi, 0
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; CHECK-NEXT: DBG_VALUE [[ARG0VREG]], $noreg, [[VARNUM]]
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; CHECK-NEXT: JCC_1 %bb.1, 4
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; CHECK-NEXT: JMP_1
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%2:gr64 = COPY $rdi
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%5:gr64 = COPY %2
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CMP32ri $esi, 0, implicit-def $eflags
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DBG_VALUE %5, $noreg, !16, !17, debug-location !18
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JCC_1 %bb.1.nou, 4, implicit $eflags
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JMP_1 %bb.2.exit
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bb.1.nou:
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successors: %bb.2.exit(0x80000000)
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; This block should receive the sunk copy and DBG_VALUE
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; CHECK-LABEL: bb.1.nou:
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; CHECK: [[SUNKVREG:%[0-9]+]]:gr64 = COPY [[ARG0VREG]]
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; CHECK-NEXT: DBG_VALUE [[SUNKVREG]], $noreg, [[VARNUM]]
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; CHECK-NEXT: ADD64ri8
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; CHECK-NEXT: JMP_1
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%1:gr64 = ADD64ri8 %5, 4, implicit-def dead $eflags
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JMP_1 %bb.2.exit
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bb.2.exit:
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; The DBG_VALUE below should have its operand copy-propagated after
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; the copy to %5 is sunk.
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; CHECK-LABEL: bb.2.exit:
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; CHECK: DBG_VALUE [[ARG0VREG]], $noreg, [[VARNUM]]
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; CHECK-NEXT: $rax = MOV64rr [[ARG0VREG]]
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; CHECK-NEXT: RET 0
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DBG_VALUE %5, _, !16, !17, debug-location !18
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$rax = MOV64rr %2
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RET 0
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...
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---
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name: test2
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tracksRegLiveness: true
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liveins:
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- { reg: '$rdi', virtual-reg: '%2' }
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- { reg: '$rsi', virtual-reg: '%2' }
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body: |
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bb.0.entry:
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successors: %bb.1.block1, %bb.2.exit
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liveins: $rdi, $esi
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; This block should _not_ have the first DBG_VALUE sunk out from it, as it
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; would pass a later DBG_VALUE of the same variable location. An undef
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; DBG_VALUE should be left behind though.
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; CHECK-LABEL: bb.0.entry:
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; CHECK: [[TEST2VREG:%[0-9]+]]:gr64 = COPY $rdi
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; CHECK-NEXT: CMP32ri $esi, 0
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; CHECK-NEXT: DBG_VALUE $noreg, $noreg, [[VAR2NUM]]
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; CHECK-NEXT: CMP32ri $esi, 0
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; CHECK-NEXT: DBG_VALUE 0, $noreg, [[VAR2NUM]]
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; CHECK-NEXT: JCC_1 %bb.1, 4
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; CHECK-NEXT: JMP_1
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%2:gr64 = COPY $rdi
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%5:gr64 = ADD64ri8 %2, 1, implicit-def dead $eflags
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CMP32ri $esi, 0, implicit-def $eflags
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DBG_VALUE %5, $noreg, !103, !17, debug-location !104
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CMP32ri $esi, 0, implicit-def $eflags
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DBG_VALUE 0, $noreg, !103, !17, debug-location !104
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JCC_1 %bb.1.block1, 4, implicit $eflags
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JMP_1 %bb.2.exit
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bb.1.block1:
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successors: %bb.2.exit
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; This block should receive no DBG_VALUE.
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; CHECK-LABEL: bb.1.block1:
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; CHECK-NOT: DBG_VALUE
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; CHECK: [[SUNKVREG2:%[0-9]+]]:gr64 = ADD64ri8 [[TEST2VREG]]
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; CHECK-NOT: DBG_VALUE
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; CHECK-NEXT: ADD64ri8
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; CHECK: JMP_1 %bb.2
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%1:gr64 = ADD64ri8 %5, 4, implicit-def dead $eflags
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JMP_1 %bb.2.exit
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bb.2.exit:
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$rax = MOV64rr %2
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RET 0
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...
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---
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name: test3
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tracksRegLiveness: true
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liveins:
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- { reg: '$rdi', virtual-reg: '%2' }
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- { reg: '$rsi', virtual-reg: '%2' }
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body: |
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bb.0.entry:
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successors: %bb.1.block1, %bb.2.exit
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liveins: $rdi, $esi
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; The copy from %2 to %5 will sink into a later block, and the first
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; DBG_VALUE cannot pass the second. But, we should be able to recover
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; the variable location through copy propagation.
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; CHECK-LABEL: bb.0.entry:
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; CHECK: [[TEST3VREG:%[0-9]+]]:gr64 = COPY $rdi
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; CHECK-NEXT: CMP32ri $esi, 0
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; CHECK-NEXT: DBG_VALUE [[TEST3VREG]], $noreg, [[VAR3NUM]]
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; CHECK-NEXT: CMP32ri $esi, 0
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; CHECK-NEXT: DBG_VALUE 0, $noreg, [[VAR3NUM]]
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; CHECK-NEXT: JCC_1 %bb.1, 4
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; CHECK-NEXT: JMP_1
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%2:gr64 = COPY $rdi
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%5:gr64 = COPY %2
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CMP32ri $esi, 0, implicit-def $eflags
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DBG_VALUE %5, $noreg, !203, !17, debug-location !204
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CMP32ri $esi, 0, implicit-def $eflags
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DBG_VALUE 0, $noreg, !203, !17, debug-location !204
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JCC_1 %bb.1.block1, 4, implicit $eflags
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JMP_1 %bb.2.exit
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bb.1.block1:
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successors: %bb.2.exit
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; This block should receive no DBG_VALUE.
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; CHECK-LABEL: bb.1.block1:
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; CHECK-NOT: DBG_VALUE
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; CHECK: COPY [[TEST3VREG]]
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; CHECK-NOT: DBG_VALUE
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; CHECK-NEXT: ADD64ri8
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; CHECK: JMP_1 %bb.2
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%1:gr64 = ADD64ri8 %5, 4, implicit-def dead $eflags
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JMP_1 %bb.2.exit
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bb.2.exit:
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$rax = MOV64rr %2
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RET 0
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...
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