776a81a483
Since a load and test instruction treat its operands as signed, it can only replace a logical compare for EQ/NE uses. Review: Ulrich Weigand https://bugs.llvm.org/show_bug.cgi?id=35662 llvm-svn: 322488
53 lines
1.3 KiB
YAML
53 lines
1.3 KiB
YAML
# RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -start-before=postrapseudos %s -o - \
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# RUN: | FileCheck %s
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#
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# Check that integer load and test instructions are not emitted for unsigned
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# comparisons unless checking for equality. That would be wrong, since the
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# operands are implicitly treated as signed values.
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# Not legal: Logical comparison used for >= (CCMask is 10).
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# CHECK-LABEL: fun0
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# CHECK-NOT: lt
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---
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name: fun0
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tracksRegLiveness: true
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body: |
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bb.0 ():
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liveins: %r1d
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renamable %r0l = L %r1d, 0, %noreg
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CLFIMux killed renamable %r0l, 0, implicit-def %cc
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BRC 14, 10, %bb.2, implicit %cc
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bb.1 ():
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liveins: %r0l
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ST killed renamable %r0l, %r15d, 164, %noreg
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bb.2 ():
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liveins: %r0l
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ST killed renamable %r0l, %r15d, 164, %noreg
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Return
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...
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# Legal: Logical comparison used for == (CCMask is 8).
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# CHECK-LABEL: fun1
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# CHECK: lt
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---
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name: fun1
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tracksRegLiveness: true
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body: |
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bb.0 ():
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liveins: %r1d
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renamable %r0l = L %r1d, 0, %noreg
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CLFIMux killed renamable %r0l, 0, implicit-def %cc
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BRC 14, 8, %bb.2, implicit %cc
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bb.1 ():
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liveins: %r0l
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ST killed renamable %r0l, %r15d, 164, %noreg
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bb.2 ():
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liveins: %r0l
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ST killed renamable %r0l, %r15d, 164, %noreg
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Return
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...
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