8940114f61
- MIParser: If the successor list is not specified successors will be added based on basic block operands in the block and possible fallthrough. - MIRPrinter: Adds a new `simplify-mir` option, with that option set: Skip printing of block successor lists in cases where the parser is guaranteed to reconstruct it. This means we still print the list if some successor cannot be determined (happens for example for jump tables), if the successor order changes or branch probabilities being unequal. Differential Revision: https://reviews.llvm.org/D31262 llvm-svn: 302289
83 lines
1.6 KiB
YAML
83 lines
1.6 KiB
YAML
# RUN: llc -march=x86-64 -run-pass none -o - %s | FileCheck %s
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# This test ensures that the MIR parser parses basic block successors correctly.
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--- |
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define i32 @foo(i32 %a) {
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entry:
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%0 = icmp sle i32 %a, 10
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br i1 %0, label %less, label %exit
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less:
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ret i32 0
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exit:
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ret i32 %a
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}
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define i32 @bar(i32 %a) {
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entry:
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%b = icmp sle i32 %a, 10
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br i1 %b, label %0, label %1
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; <label>:0
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ret i32 0
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; <label>:1
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ret i32 %a
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}
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...
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---
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name: foo
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body: |
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; CHECK-LABEL: bb.0.entry:
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; CHECK-LABEL: bb.1.less:
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bb.0.entry:
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successors: %bb.1.less, %bb.2.exit
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liveins: %edi
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CMP32ri8 %edi, 10, implicit-def %eflags
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JG_1 %bb.2.exit, implicit killed %eflags
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bb.1.less:
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%eax = MOV32r0 implicit-def dead %eflags
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RETQ killed %eax
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bb.2.exit:
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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: bar
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body: |
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; CHECK-LABEL: name: bar
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; Verify that we can have multiple lists of successors that will be merged
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; into one.
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; CHECK-LABEL: bb.0.entry:
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; CHECK: successors: %bb.1(0x80000000), %bb.2(0x00000000)
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bb.0.entry:
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liveins: %edi
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successors: %bb.1
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successors: %bb.2
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CMP32ri8 %edi, 10, implicit-def %eflags
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JG_1 %bb.2, implicit killed %eflags
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; Verify that we can have an empty list of successors.
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; CHECK-LABEL: bb.1:
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; CHECK-NEXT: %eax = MOV32r0 implicit-def dead %eflags
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bb.1:
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successors:
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%eax = MOV32r0 implicit-def dead %eflags
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RETQ killed %eax
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bb.2:
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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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