a1b78fb929
Currently, JT creates and updates local instances of BPI\BFI. As a result global ones have to be invalidated if JT made any changes. In fact, JT doesn't use any information from BPI/BFI for the sake of the transformation itself. It only creates BPI/BFI to keep them up to date. But since it updates local copies (besides cases when it updates profile metadata) it just waste of time. Current patch is a rework of D124439. D124439 makes one step and replaces local copies with global ones retrieved through AnalysisPassManager. Here we do one more step and don't create BPI/BFI if the only reason of creation is to keep BPI/BFI up to date. Overall logic is the following. If there is cached BPI/BFI then update it along the transformations. If there is no existing BPI/BFI, then create it only if it is required to update profile metadata. Please note if BPI/BFI exists on exit from JT (either cached or created) it is always up to date and no reason to invalidate it. Reviewed By: mkazantsev Differential Revision: https://reviews.llvm.org/D136827
32 lines
1014 B
LLVM
32 lines
1014 B
LLVM
; RUN: opt -debug-only=branch-prob -passes="require<branch-prob>,jump-threading" -S %s 2>&1 | FileCheck %s
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; RUN: opt -debug-only=branch-prob -passes=jump-threading -S %s 2>&1 | FileCheck %s --check-prefix=CHECK-NOBPI
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; REQUIRES: asserts
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; Make sure that we set edge probabilities for bb2 as we
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; call DuplicateCondBranchOnPHIIntoPred(bb3, {bb2}).
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;
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; CHECK-LABEL: ---- Branch Probability Info : foo
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; CHECK: set edge bb2 -> 0 successor probability to 0x80000000 / 0x80000000 = 100.00%
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; CHECK-NEXT: set edge bb2 -> 1 successor probability to 0x00000000 / 0x80000000 = 0.00%
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; CHECK-NOBPI-NOT: ---- Branch Probability Info : foo
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define void @foo(i1 %f0, i1 %f1, i1 %f2) !prof !{!"function_entry_count", i64 0} {
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; CHECK-LABEL: @foo(
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bb1:
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br i1 %f0, label %bb3, label %bb2
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bb2:
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; CHECK: bb2:
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; CHECK-NEXT: br i1 %f2, label %exit1, label %unreach
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br label %bb3
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bb3:
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%ph = phi i1 [ %f1, %bb1 ], [ %f2, %bb2 ]
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br i1 %ph, label %exit1, label %unreach
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exit1:
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ret void
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unreach:
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unreachable
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}
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