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5d51a489ae
(This is the second attempt to submit this patch. The first caused two assertion failures and was reverted. See https://llvm.org/bugs/show_bug.cgi?id=25687) The patch in http://reviews.llvm.org/D13745 is broken into four parts: 1. New interfaces without functional changes (http://reviews.llvm.org/D13908). 2. Use new interfaces in SelectionDAG, while in other passes treat probabilities as weights (http://reviews.llvm.org/D14361). 3. Use new interfaces in all other passes. 4. Remove old interfaces. This patch is 3+4 above. In this patch, MBB won't provide weight-based interfaces any more, which are totally replaced by probability-based ones. The interface addSuccessor() is redesigned so that the default probability is unknown. We allow unknown probabilities but don't allow using it together with known probabilities in successor list. That is to say, we either have a list of successors with all known probabilities, or all unknown probabilities. In the latter case, we assume each successor has 1/N probability where N is the number of successors. An assertion checks if the user is attempting to add a successor with the disallowed mixed use as stated above. This can help us catch many misuses. All uses of weight-based interfaces are now updated to use probability-based ones. Differential revision: http://reviews.llvm.org/D14973 llvm-svn: 254377
84 lines
1.8 KiB
YAML
84 lines
1.8 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 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: successors: %bb.1.less(0x40000000 / 0x80000000 = 50.00%), %bb.2.exit(0x40000000 / 0x80000000 = 50.00%)
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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 / 0x80000000 = 100.00%), %bb.2(0x00000000 / 0x80000000 = 0.00%)
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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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