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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
74 lines
1.8 KiB
YAML
74 lines
1.8 KiB
YAML
# RUN: llc -march=x86-64 -enable-shrink-wrap=true -start-after shrink-wrap -stop-after shrink-wrap -o /dev/null %s | FileCheck %s
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# This test ensures that the MIR parser parses the save and restore points in
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# the machine frame info correctly.
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--- |
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define i32 @foo(i32 %a, i32 %b) {
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entry:
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%tmp = alloca i32, align 4
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%tmp2 = icmp slt i32 %a, %b
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br i1 %tmp2, label %true, label %false
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true:
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store i32 %a, i32* %tmp, align 4
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%tmp4 = call i32 @doSomething(i32 0, i32* %tmp)
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br label %false
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false:
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%tmp.0 = phi i32 [ %tmp4, %true ], [ %a, %entry ]
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ret i32 %tmp.0
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}
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declare i32 @doSomething(i32, i32*)
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...
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---
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name: foo
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tracksRegLiveness: true
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liveins:
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- { reg: '%edi' }
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- { reg: '%esi' }
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# CHECK: frameInfo:
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# CHECK: savePoint: '%bb.2.true'
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# CHECK-NEXT: restorePoint: '%bb.2.true'
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# CHECK: stack
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frameInfo:
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maxAlignment: 4
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hasCalls: true
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savePoint: '%bb.2.true'
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restorePoint: '%bb.2.true'
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stack:
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- { id: 0, name: tmp, offset: 0, size: 4, alignment: 4 }
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body: |
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bb.0:
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successors: %bb.2.true, %bb.1
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liveins: %edi, %esi
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%eax = COPY %edi
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CMP32rr %eax, killed %esi, implicit-def %eflags
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JL_1 %bb.2.true, implicit killed %eflags
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bb.1:
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successors: %bb.3.false
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liveins: %eax
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JMP_1 %bb.3.false
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bb.2.true:
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successors: %bb.3.false
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liveins: %eax
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MOV32mr %stack.0.tmp, 1, _, 0, _, killed %eax
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ADJCALLSTACKDOWN64 0, 0, implicit-def %rsp, implicit-def dead %eflags, implicit %rsp
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%rsi = LEA64r %stack.0.tmp, 1, _, 0, _
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%edi = MOV32r0 implicit-def dead %eflags
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CALL64pcrel32 @doSomething, csr_64, implicit %rsp, implicit %edi, implicit %rsi, implicit-def %rsp, implicit-def %eax
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ADJCALLSTACKUP64 0, 0, implicit-def %rsp, implicit-def dead %eflags, implicit %rsp
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bb.3.false:
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liveins: %eax
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RETQ %eax
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...
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