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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
89 lines
2.0 KiB
YAML
89 lines
2.0 KiB
YAML
# RUN: not llc -march=x86-64 -start-after prologepilog -stop-after prologepilog -o /dev/null %s 2>&1 | FileCheck %s
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--- |
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define i32 @compute(i32 %a) {
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body:
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ret i32 %a
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}
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define i32 @func(i32 %a) {
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entry:
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%b = alloca i32
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store i32 %a, i32* %b
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br label %check
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check:
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%comp = icmp sle i32 %a, 10
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br i1 %comp, label %loop, label %exit
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loop:
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%c = load i32, i32* %b
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%d = call i32 @compute(i32 %c)
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%e = sub i32 %d, 1
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store i32 %e, i32* %b
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br label %check
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exit:
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ret i32 0
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}
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...
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---
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name: compute
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tracksRegLiveness: true
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body: |
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bb.0.body:
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liveins: %edi
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%eax = COPY killed %edi
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RETQ killed %eax
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...
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---
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name: func
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tracksRegLiveness: true
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frameInfo:
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stackSize: 24
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maxAlignment: 4
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adjustsStack: true
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hasCalls: true
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fixedStack:
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# CHECK: [[@LINE+1]]:93: expected a named register
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- { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '%0' }
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stack:
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- { id: 0, name: b, offset: -20, size: 4, alignment: 4 }
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body: |
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bb.0.entry:
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successors: %bb.1.check
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liveins: %edi, %rbx
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frame-setup PUSH64r killed %rbx, implicit-def %rsp, implicit %rsp
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%rsp = frame-setup SUB64ri8 %rsp, 16, implicit-def dead %eflags
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%ebx = COPY %edi
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MOV32mr %rsp, 1, _, 12, _, %ebx
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bb.1.check:
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successors: %bb.2.loop, %bb.3.exit
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liveins: %ebx
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CMP32ri8 %ebx, 10, implicit-def %eflags
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JG_1 %bb.3.exit, implicit killed %eflags
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JMP_1 %bb.2.loop
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bb.2.loop:
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successors: %bb.1.check
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liveins: %ebx
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%edi = MOV32rm %rsp, 1, _, 12, _
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CALL64pcrel32 @compute, csr_64, implicit %rsp, implicit %edi, implicit-def %rsp, implicit-def %eax
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%eax = DEC32r killed %eax, implicit-def dead %eflags
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MOV32mr %rsp, 1, _, 12, _, killed %eax
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JMP_1 %bb.1.check
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bb.3.exit:
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%eax = MOV32r0 implicit-def dead %eflags
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%rsp = ADD64ri8 %rsp, 16, implicit-def dead %eflags
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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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