derek.holloway
7502bf64a4
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50 lines
2.0 KiB
LLVM
50 lines
2.0 KiB
LLVM
; RUN: llc -mtriple=x86_64-- -O0 -pgo-kind=pgo-sample-use-pipeline -debug-pass=Structure %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=PASSES
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; RUN: llc -mtriple=x86_64-- -O0 -pgo-kind=pgo-sample-use-pipeline -debug-only=branch-prob %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=BRANCH_PROB
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; RUN: llc -mtriple=x86_64-- -O0 -pgo-kind=pgo-sample-use-pipeline -stop-after=finalize-isel %s -o - | FileCheck %s --check-prefix=MIR
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; REQUIRES: asserts
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; This test verifies that PGO profile information (branch weights) is preserved
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; during instruction selection at -O0.
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; Test function with explicit branch weights from PGO.
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define i32 @test_pgo_preservation(i32 %x) !prof !15 {
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entry:
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%cmp = icmp sgt i32 %x, 10
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; This branch has bias: 97 taken vs 3 not taken
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br i1 %cmp, label %if.then, label %if.else, !prof !16
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if.then:
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; Hot path - should have high frequency
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%add = add nsw i32 %x, 100
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br label %if.end
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if.else:
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; Cold path - should have low frequency
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%sub = sub nsw i32 %x, 50
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br label %if.end
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if.end:
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%result = phi i32 [ %add, %if.then ], [ %sub, %if.else ]
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ret i32 %result
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}
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; Profile metadata with branch weights 97:3.
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!15 = !{!"function_entry_count", i64 100}
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!16 = !{!"branch_weights", i32 97, i32 3}
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; Verify that Branch Probability Analysis runs at O0.
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; PASSES: Branch Probability Analysis
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; Verify that the branch probabilities reflect the exact profile data.
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; BRANCH_PROB: ---- Branch Probability Info : test_pgo_preservation ----
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; BRANCH_PROB: set edge entry -> 0 successor probability to {{.*}} = 97.00%
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; BRANCH_PROB: set edge entry -> 1 successor probability to {{.*}} = 3.00%
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; Verify that machine IR preserves the branch probabilities from profile data
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; MIR: bb.0.entry:
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; MIR-NEXT: successors: %bb.{{[0-9]+}}({{0x03d70a3d|0x7c28f5c3}}), %bb.{{[0-9]+}}({{0x7c28f5c3|0x03d70a3d}})
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; The two successor probability values should be:
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; - 0x7c28f5c3: approximately 97% (high probability successor)
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; - 0x03d70a3d: approximately 3% (low probability successor)
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