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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
65 lines
2.3 KiB
YAML
65 lines
2.3 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 external symbol machine
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# operands correctly.
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--- |
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@__stack_chk_guard = external global i8*
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define i32 @test(i32 %n) #0 {
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entry:
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%StackGuardSlot = alloca i8*
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%StackGuard = load i8*, i8** @__stack_chk_guard
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call void @llvm.stackprotector(i8* %StackGuard, i8** %StackGuardSlot)
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%a = alloca [128 x i32], align 16
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%idxprom = sext i32 %n to i64
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%arrayidx = getelementptr inbounds [128 x i32], [128 x i32]* %a, i64 0, i64 %idxprom
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%0 = load i32, i32* %arrayidx, align 4
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call void @llvm.stackprotectorcheck(i8** @__stack_chk_guard)
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ret i32 %0
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}
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declare void @llvm.stackprotector(i8*, i8**) #1
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declare void @llvm.stackprotectorcheck(i8**) #1
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attributes #0 = { ssp "stack-protector-buffer-size"="8" }
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attributes #1 = { nounwind }
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...
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---
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name: test
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tracksRegLiveness: true
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body: |
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bb.0.entry:
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successors: %bb.1.entry, %bb.2.entry
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liveins: %edi
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%rsp = SUB64ri32 %rsp, 520, implicit-def %eflags
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%rcx = LOAD_STACK_GUARD
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MOV64mr %rsp, 1, _, 512, _, %rcx
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%rax = MOVSX64rr32 %edi
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%eax = MOV32rm %rsp, 4, %rax, 0, _
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CMP64rm %rcx, %rsp, 1, _, 512, _, implicit-def %eflags
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JNE_1 %bb.2.entry, implicit %eflags
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bb.1.entry:
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liveins: %eax
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%rsp = ADD64ri32 %rsp, 520, implicit-def %eflags
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RETQ %eax
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bb.2.entry:
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; CHECK: CALL64pcrel32 $__stack_chk_fail,
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; CHECK-NEXT: CALL64pcrel32 $__stack_chk_fail.09-_,
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; CHECK-NEXT: CALL64pcrel32 $"__stack_chk_fail$",
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; CHECK-NEXT: CALL64pcrel32 $"$Quoted \09 External symbol \11 ",
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; CHECK-NEXT: CALL64pcrel32 $__stack_chk_fail + 2,
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; CHECK-NEXT: CALL64pcrel32 $" check stack - 20" - 20,
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CALL64pcrel32 $__stack_chk_fail, csr_64, implicit %rsp, implicit-def %rsp
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CALL64pcrel32 $__stack_chk_fail.09-_, csr_64, implicit %rsp, implicit-def %rsp
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CALL64pcrel32 $__stack_chk_fail$, csr_64, implicit %rsp, implicit-def %rsp
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CALL64pcrel32 $"$Quoted \09 External symbol \11 ", csr_64, implicit %rsp, implicit-def %rsp
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CALL64pcrel32 $__stack_chk_fail + 2, csr_64, implicit %rsp, implicit-def %rsp
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CALL64pcrel32 $" check stack - 20" - 20, csr_64, implicit %rsp, implicit-def %rsp
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...
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