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
31 lines
740 B
LLVM
31 lines
740 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 clear edge probabilities for bb1 as we fold
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; the conditional branch in it.
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; CHECK: eraseBlock bb1
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; CHECK-NOBPI-NOT: eraseBlock bb1
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define void @foo(i32 %i, i32 %len) !prof !0 {
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; CHECK-LABEL: @foo
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%i.inc = add nuw i32 %i, 1
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%c0 = icmp ult i32 %i.inc, %len
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br i1 %c0, label %bb1, label %bb2
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bb1:
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; CHECK: bb1:
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%c1 = icmp ult i32 %i, %len
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br i1 %c1, label %bb2, label %bb3
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bb2:
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ret void
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bb3:
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; CHECK-NOT: bb3:
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ret void
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}
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!0 = !{!"function_entry_count", i64 0}
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