7df28fd61a
Uses machine analyses to emit PGOAnalysisMap into the bb-addr-map ELF section. Implements filecheck tests to verify emitting new fields. This patch emits optional PGO related analyses into the bb-addr-map ELF section during AsmPrinter. This currently supports Function Entry Count, Machine Block Frequencies. and Machine Branch Probabilities. Each is independently enabled via the `feature` byte of `bb-addr-map` for the given function. A part of [RFC - PGO Accuracy Metrics: Emitting and Evaluating Branch and Block Analysis](https://discourse.llvm.org/t/rfc-pgo-accuracy-metrics-emitting-and-evaluating-branch-and-block-analysis/73902).
26 lines
796 B
LLVM
26 lines
796 B
LLVM
;; Verify that the BB address map is not emitted for empty functions.
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; RUN: llc < %s -mtriple=x86_64 -basic-block-sections=labels | FileCheck %s --check-prefixes=CHECK,BASIC
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; RUN: llc < %s -mtriple=x86_64 -basic-block-sections=labels -pgo-analysis-map=func-entry-count,bb-freq | FileCheck %s --check-prefixes=CHECK,PGO
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define void @empty_func() {
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entry:
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unreachable
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}
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; CHECK: {{^ *}}.text{{$}}
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; CHECK: empty_func:
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; CHECK: .Lfunc_begin0:
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; CHECK-NOT: .section .llvm_bb_addr_map
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define void @func() {
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entry:
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ret void
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}
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; CHECK: func:
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; CHECK: .Lfunc_begin1:
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; CHECK: .section .llvm_bb_addr_map,"o",@llvm_bb_addr_map,.text{{$}}
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; CHECK-NEXT: .byte 2 # version
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; BASIC-NEXT: .byte 0 # feature
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; PGO-NEXT: .byte 3 # feature
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; CHECK-NEXT: .quad .Lfunc_begin1 # function address
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