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12f5193bf4
Pseudo probes, when scattered in a block, can be chained dependencies of other regular DAG nodes and block DAG combine optimizations. To fix this, scattered probes in a block are grouped and placed at the beginning of the block. This shouldn't affect the profile quality. Test Plan: Reviewed By: wenlei, wmi Differential Revision: https://reviews.llvm.org/D100002
40 lines
1.6 KiB
LLVM
40 lines
1.6 KiB
LLVM
; REQUIRES: x86_64-linux
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; RUN: opt < %s -codegenprepare -mtriple=x86_64 -S -o %t
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; RUN: FileCheck %s < %t --check-prefix=IR
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; RUN: llc -mtriple=x86_64-- -stop-after=finalize-isel %t -o - | FileCheck %s --check-prefix=MIR
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define internal i32 @arc_compare() {
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entry:
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%0 = load i64, i64* undef, align 8
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br i1 undef, label %return, label %if.end
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if.end: ; preds = %entry
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;; Check pseudo probes are next to each other at the beginning of this block.
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; IR-label: if.end
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; IR: call void @llvm.pseudoprobe(i64 5116412291814990879, i64 1, i32 0, i64 -1)
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; IR: call void @llvm.pseudoprobe(i64 5116412291814990879, i64 3, i32 0, i64 -1)
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call void @llvm.pseudoprobe(i64 5116412291814990879, i64 1, i32 0, i64 -1)
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%1 = load i16, i16* undef, align 8
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call void @llvm.pseudoprobe(i64 5116412291814990879, i64 3, i32 0, i64 -1)
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%2 = and i16 %1, 16
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%3 = icmp eq i16 %2, 0
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;; Check the load-and-cmp sequence is fold into a test instruction.
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; MIR-label: bb.1.if.end
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; MIR: %[[#REG:]]:gr64 = IMPLICIT_DEF
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; MIR: TEST8mi killed %[[#REG]], 1, $noreg, 0, $noreg, 16
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; MIR: JCC_1
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br i1 %3, label %return, label %if.end6
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if.end6: ; preds = %if.end
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call void @llvm.pseudoprobe(i64 5116412291814990879, i64 5, i32 0, i64 -1)
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br label %return
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return: ; preds = %if.end6, %if.end, %entry
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ret i32 undef
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}
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; Function Attrs: inaccessiblememonly nounwind willreturn
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declare void @llvm.pseudoprobe(i64, i64, i32, i64) #0
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attributes #0 = { inaccessiblememonly nounwind willreturn }
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