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d0ebd8797c
Pseudo probe are currently given a slot index like other regular instructions. This affects register pressure and lifetime weight computation because of enlarged lifetime length with pseudo probe instructions. As a consequence, program could get different code generated w/ and w/o pseudo probes. I'm closing the gap by excluding pseudo probes from stack index and downstream register allocation related passes. Reviewed By: wmi Differential Revision: https://reviews.llvm.org/D100334
22 lines
761 B
LLVM
22 lines
761 B
LLVM
; REQUIRES: x86_64-linux
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; RUN: llc -print-after=slotindexes -stop-after=slotindexes -mtriple=x86_64-- %s -filetype=asm -o %t 2>&1 | FileCheck %s
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define void @foo(i32* %p) {
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store i32 0, i32* %p
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call void @llvm.pseudoprobe(i64 5116412291814990879, i64 1, i32 0, i64 -1)
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store i32 0, i32* %p
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ret void
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}
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;; Check the pseudo probe instruction isn't assigned a slot index.
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;CHECK: IR Dump {{.*}}
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;CHECK: # Machine code for function foo{{.*}}
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;CHECK: {{[0-9]+}}B bb.0 (%ir-block.0)
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;CHECK: {{[0-9]+}}B %0:gr64 = COPY killed $rdi
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;CHECK: {{^}} PSEUDO_PROBE 5116412291814990879
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;CHECK: {{[0-9]+}}B MOV32mi
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;CHECK: {{[0-9]+}}B RET 0
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declare void @llvm.pseudoprobe(i64, i64, i32, i64) #0
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attributes #0 = { inaccessiblememonly nounwind willreturn } |