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c21c095194
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.
llvm-svn: 244982
43 lines
1.3 KiB
YAML
43 lines
1.3 KiB
YAML
# RUN: not llc -march=x86-64 -start-after branch-folder -stop-after branch-folder -o /dev/null %s 2>&1 | FileCheck %s
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--- |
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declare void @foo(i32)
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define i32 @test(i32 %a, i32 %b, i32 %c, i32 %d) {
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entry:
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%add = add nsw i32 %b, %a
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%add1 = add nsw i32 %add, %c
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%add2 = add nsw i32 %add1, %d
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tail call void @foo(i32 %add2)
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%add6 = add nsw i32 %add2, %add2
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ret i32 %add6
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}
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...
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---
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name: test
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tracksRegLiveness: true
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frameInfo:
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stackSize: 8
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adjustsStack: true
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hasCalls: true
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fixedStack:
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- { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16 }
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body: |
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bb.0.entry:
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PUSH64r killed %rbx, implicit-def %rsp, implicit %rsp
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CFI_INSTRUCTION .cfi_def_cfa_offset 16
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; CHECK: [[@LINE+1]]:33: expected a cfi register
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CFI_INSTRUCTION .cfi_offset %0, -16
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%ebx = COPY %edi, implicit-def %rbx
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%ebx = ADD32rr %ebx, killed %esi, implicit-def dead %eflags
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%ebx = ADD32rr %ebx, killed %edx, implicit-def dead %eflags
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%ebx = ADD32rr %ebx, killed %ecx, implicit-def dead %eflags
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%edi = COPY %ebx
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CALL64pcrel32 @foo, csr_64, implicit %rsp, implicit %edi, implicit-def %rsp
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%eax = LEA64_32r killed %rbx, 1, %rbx, 0, _
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%rbx = POP64r implicit-def %rsp, implicit %rsp
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RETQ %eax
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...
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