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Fix minor deficiency in machine-sink.
Register uses that are MRI->isConstantPhysReg() should not inhibit sinking transformation. Reviewed By: StephenTozer Differential Revision: https://reviews.llvm.org/D111531
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# RUN: llc -mtriple=riscv32 %s -run-pass=machine-sink -o - | FileCheck %s | ||
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# Verify that sinking of '%20:gpr = LUI 1, implicit $x0' is not inhibited by | ||
# the implicit use of '$x0'. | ||
# Register '$x0' is a 'MRI->isConstantPhysReg()' on RISCV and such uses should | ||
# not inhibit sinking transformation even though they are livein to the block | ||
# they are to be sunk into (inhibit under such conditions should only happen | ||
# for defines). | ||
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--- | ||
name: f | ||
tracksRegLiveness: true | ||
body: | | ||
; CHECK-LABEL: bb.1: | ||
; CHECK-NEXT: successors: %bb.3(0x80000000) | ||
; CHECK-NEXT: liveins: $x0 | ||
; CHECK-NEXT: {{ $}} | ||
; CHECK-NEXT: [[LUI:%[0-9]+]]:gpr = LUI 1, implicit $x0 | ||
bb.0: | ||
liveins: $x10 | ||
%10:gpr = COPY $x10 | ||
%20:gpr = LUI 1, implicit $x0 | ||
BEQ %10, %10, %bb.2 | ||
PseudoBR %bb.1 | ||
bb.1: | ||
liveins: $x0 | ||
%30:gpr = ADDI %20, 5 | ||
PseudoBR %bb.3 | ||
bb.2: | ||
PseudoBR %bb.3 | ||
bb.3: | ||
PseudoRET | ||
... |