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5d09c2f25d
This commit modifies the way the machine basic blocks are serialized - now the
machine basic blocks are serialized using a custom syntax instead of relying on
YAML primitives. Instead of using YAML mappings to represent the individual
machine basic blocks in a machine function's body, the new syntax uses a single
YAML block scalar which contains all of the machine basic blocks and
instructions for that function.
This is an example of a function's body that uses the old syntax:
body:
- id: 0
name: entry
instructions:
- '%eax = MOV32r0 implicit-def %eflags'
- 'RETQ %eax'
...
The same body is now written like this:
body: |
bb.0.entry:
%eax = MOV32r0 implicit-def %eflags
RETQ %eax
...
This syntax change is motivated by the fact that the bundled machine
instructions didn't map that well to the old syntax which was using a single
YAML sequence to store all of the machine instructions in a block. The bundled
machine instructions internally use flags like BundledPred and BundledSucc to
determine the bundles, and serializing them as MI flags using the old syntax
would have had a negative impact on the readability and the ease of editing
for MIR files. The new syntax allows me to serialize the bundled machine
instructions using a block construct without relying on the internal flags,
for example:
BUNDLE implicit-def dead %itstate, implicit-def %s1 ... {
t2IT 1, 24, implicit-def %itstate
%s1 = VMOVS killed %s0, 1, killed %cpsr, implicit killed %itstate
}
This commit also converts the MIR testcases to the new syntax. I developed
a script that can convert from the old syntax to the new one. I will post the
script on the llvm-commits mailing list in the thread for this commit.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244982 91177308-0d34-0410-b5e6-96231b3b80d8
64 lines
2.1 KiB
YAML
64 lines
2.1 KiB
YAML
# RUN: llc -march=x86-64 -start-after machine-sink -stop-after machine-sink -o /dev/null %s | FileCheck %s
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# This test ensures that the MIR parser parses the metadata machine operands
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# correctly.
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--- |
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define i32 @test(i32 %x) #0 {
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entry:
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%x.addr = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !12, metadata !13), !dbg !14
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%0 = load i32, i32* %x.addr, align 4, !dbg !15
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ret i32 %0, !dbg !15
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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attributes #0 = { nounwind "no-frame-pointer-elim"="false" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!9, !10}
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!llvm.ident = !{!11}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "test.ll", directory: "")
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!2 = !{}
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!3 = !{!4}
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!4 = !DISubprogram(name: "test", scope: !5, file: !5, line: 4, type: !6, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: false, function: i32 (i32)* @test, variables: !2)
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!5 = !DIFile(filename: "test.c", directory: "")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !8}
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!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !{i32 2, !"Dwarf Version", i32 4}
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!10 = !{i32 2, !"Debug Info Version", i32 3}
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!11 = !{!"clang version 3.7.0"}
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!12 = !DILocalVariable(name: "x", arg: 1, scope: !4, file: !5, line: 4, type: !8)
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!13 = !DIExpression()
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!14 = !DILocation(line: 4, scope: !4)
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!15 = !DILocation(line: 8, scope: !4)
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...
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---
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name: test
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isSSA: true
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tracksRegLiveness: true
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registers:
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- { id: 0, class: gr32 }
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frameInfo:
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maxAlignment: 4
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stack:
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- { id: 0, name: x.addr, size: 4, alignment: 4 }
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body: |
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bb.0.entry:
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liveins: %edi
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; CHECK: %0 = COPY %edi
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; CHECK-NEXT: DBG_VALUE _, 0, !12, !13
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%0 = COPY %edi
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DBG_VALUE _, 0, !12, ! 13
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MOV32mr %stack.0.x.addr, 1, _, 0, _, %0
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%eax = COPY %0
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RETQ %eax
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...
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