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[MachineSink] Don't reject sinking because of dead def in isProfitabl…
…eToSinkTo(). An instruction should be sunk (if otherwise legal and profitable) regardless of if it has a dead def of a physreg or not. Physreg defs are checked in other places and sinking is only done with dead defs of regs that are not live into the target MBB. Differential Revision: https://reviews.llvm.org/D150447 Reviewed By: sebastian-ne, arsenm
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Original file line number | Diff line number | Diff line change |
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# RUN: llc -mtriple=s390x-linux-gnu -mcpu=z15 -O3 -run-pass=machine-sink %s -o - \ | ||
# RUN: -verify-machineinstrs | FileCheck %s | ||
# | ||
# Test that the AGHIK can be sunk into %bb.4. It has a def of CC, but it is dead. | ||
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--- | | ||
define void @fun() { ret void } | ||
... | ||
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# CHECK-LABEL: bb.4: | ||
# CHECK: %1:gr64bit = nsw AGHIK %0, -4, implicit-def dead $cc | ||
# CHECK-NEXT: CGHI %1, 0, implicit-def $cc | ||
# CHECK-NEXT: BRC 14, 6, %bb.1, implicit $cc | ||
# CHECK-NEXT: J %bb.5 | ||
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--- | ||
name: fun | ||
alignment: 16 | ||
tracksRegLiveness: true | ||
registers: | ||
- { id: 0, class: gr64bit } | ||
- { id: 1, class: gr64bit } | ||
- { id: 2, class: grx32bit } | ||
- { id: 3, class: gr64bit } | ||
frameInfo: | ||
maxAlignment: 1 | ||
machineFunctionInfo: {} | ||
body: | | ||
bb.0: | ||
%2:grx32bit = LHIMux 0 | ||
%3:gr64bit = IMPLICIT_DEF | ||
bb.1: | ||
%0:gr64bit = PHI %3, %bb.0, %1, %bb.4 | ||
bb.2: | ||
%1:gr64bit = nsw AGHIK %0, -4, implicit-def dead $cc | ||
CHIMux %2, 0, implicit-def $cc | ||
BRC 14, 6, %bb.4, implicit $cc | ||
J %bb.3 | ||
bb.3: | ||
bb.4: | ||
CGHI %1, 0, implicit-def $cc | ||
BRC 14, 6, %bb.1, implicit $cc | ||
J %bb.5 | ||
bb.5: | ||
Return | ||
... |
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