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[SystemZ] Optimize floating-point comparisons with zero

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This follows the same lines as the integer code.  In the end it seemed
easier to have a second 4-bit mask in TSFlags to specify the compare-like
CC values.  That eats one more TSFlags bit than adding a CCHasUnordered
would have done, but it feels more concise.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187883 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Sandiford
2013-08-07 11:10:06 +00:00
parent e0bbf7288c
commit 29e873ddb6
7 changed files with 435 additions and 74 deletions
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3
lib/Target/SystemZ/SystemZInstrInfo.cpp
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@@ -770,6 +770,9 @@ unsigned SystemZInstrInfo::getLoadAndTest(unsigned Opcode) const {
case SystemZ::LR: return SystemZ::LTR;
case SystemZ::LGFR: return SystemZ::LTGFR;
case SystemZ::LGR: return SystemZ::LTGR;
case SystemZ::LER: return SystemZ::LTEBR;
case SystemZ::LDR: return SystemZ::LTDBR;
case SystemZ::LXR: return SystemZ::LTXBR;
default: return 0;
}
}