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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
151 lines
2.9 KiB
YAML
151 lines
2.9 KiB
YAML
# RUN: llc -march=x86-64 -start-after branch-folder -stop-after branch-folder -o /dev/null %s | FileCheck %s
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# This test ensures that the MIR parser parses the jump table info and jump
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# table operands correctly.
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--- |
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define i32 @test_jumptable(i32 %in) {
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entry:
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switch i32 %in, label %def [
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i32 0, label %lbl1
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i32 1, label %lbl2
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i32 2, label %lbl3
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i32 3, label %lbl4
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]
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def:
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ret i32 0
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lbl1:
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ret i32 1
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lbl2:
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ret i32 2
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lbl3:
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ret i32 4
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lbl4:
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ret i32 8
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}
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define i32 @test_jumptable2(i32 %in) {
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entry:
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switch i32 %in, label %def [
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i32 0, label %lbl1
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i32 1, label %lbl2
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i32 2, label %lbl3
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i32 3, label %lbl4
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]
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def:
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ret i32 0
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lbl1:
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ret i32 1
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lbl2:
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ret i32 2
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lbl3:
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ret i32 4
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lbl4:
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ret i32 8
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}
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...
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---
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name: test_jumptable
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# CHECK: jumpTable:
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# CHECK-NEXT: kind: label-difference32
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# CHECK-NEXT: entries:
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# CHECK-NEXT: - id: 0
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# CHECK-NEXT: blocks: [ '%bb.3.lbl1', '%bb.4.lbl2', '%bb.5.lbl3', '%bb.6.lbl4' ]
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# CHECK_NEXT: body:
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jumpTable:
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kind: label-difference32
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entries:
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- id: 0
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blocks: [ '%bb.3.lbl1', '%bb.4.lbl2', '%bb.5.lbl3', '%bb.6.lbl4' ]
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body: |
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bb.0.entry:
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successors: %bb.2.def, %bb.1.entry
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%eax = MOV32rr %edi, implicit-def %rax
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CMP32ri8 %edi, 3, implicit-def %eflags
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JA_1 %bb.2.def, implicit %eflags
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bb.1.entry:
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successors: %bb.3.lbl1, %bb.4.lbl2, %bb.5.lbl3, %bb.6.lbl4
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; CHECK: %rcx = LEA64r %rip, 1, _, %jump-table.0, _
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%rcx = LEA64r %rip, 1, _, %jump-table.0, _
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%rax = MOVSX64rm32 %rcx, 4, %rax, 0, _
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%rax = ADD64rr %rax, %rcx, implicit-def %eflags
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JMP64r %rax
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bb.2.def:
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%eax = MOV32r0 implicit-def %eflags
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RETQ %eax
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bb.3.lbl1:
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%eax = MOV32ri 1
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RETQ %eax
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bb.4.lbl2:
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%eax = MOV32ri 2
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RETQ %eax
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bb.5.lbl3:
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%eax = MOV32ri 4
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RETQ %eax
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bb.6.lbl4:
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%eax = MOV32ri 8
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RETQ %eax
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...
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---
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name: test_jumptable2
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jumpTable:
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kind: label-difference32
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entries:
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- id: 1
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blocks: [ '%bb.3.lbl1', '%bb.4.lbl2', '%bb.5.lbl3', '%bb.6.lbl4' ]
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body: |
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bb.0.entry:
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successors: %bb.2.def, %bb.1.entry
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%eax = MOV32rr %edi, implicit-def %rax
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CMP32ri8 %edi, 3, implicit-def %eflags
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JA_1 %bb.2.def, implicit %eflags
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bb.1.entry:
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successors: %bb.3.lbl1, %bb.4.lbl2, %bb.5.lbl3, %bb.6.lbl4
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; Verify that the printer will use an id of 0 for this jump table:
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; CHECK: %rcx = LEA64r %rip, 1, _, %jump-table.0, _
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%rcx = LEA64r %rip, 1, _, %jump-table.1, _
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%rax = MOVSX64rm32 %rcx, 4, %rax, 0, _
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%rax = ADD64rr %rax, %rcx, implicit-def %eflags
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JMP64r %rax
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bb.2.def:
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%eax = MOV32r0 implicit-def %eflags
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RETQ %eax
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bb.3.lbl1:
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%eax = MOV32ri 1
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RETQ %eax
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bb.4.lbl2:
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%eax = MOV32ri 2
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RETQ %eax
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bb.5.lbl3:
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%eax = MOV32ri 4
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RETQ %eax
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bb.6.lbl4:
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%eax = MOV32ri 8
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RETQ %eax
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...
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