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Fix a bug which caused us to never be able to use signed comparisons for

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equality comparisons of a constant.  This allows us to codegen the 'sintzero'
loop in PR1288 as:

LBB1_1: ;cond_next
        li r4, 0
        addi r2, r2, 1
        stw r4, 0(r3)
        addi r3, r3, 4
        cmpwi cr0, r2, -1
        bne cr0, LBB1_1 ;cond_next

instead of:

LBB1_1: ;cond_next
        addi r2, r2, 1
        li r4, 0
        xoris r5, r2, 65535
        stw r4, 0(r3)
        addi r3, r3, 4
        cmplwi cr0, r5, 65535
        bne cr0, LBB1_1 ;cond_next

This implements CodeGen/PowerPC/compare-simm.ll, and also cuts 74
instructions out of kc++.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35590 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-04-02 05:59:42 +00:00
parent 465b7157d1
commit aa43e9f73b
1 changed files with 1 additions and 1 deletions
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2
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@ -508,7 +508,7 @@ SDOperand PPCDAGToDAGISel::SelectCC(SDOperand LHS, SDOperand RHS,
return SDOperand(CurDAG->getTargetNode(PPC::CMPLWI, MVT::i32, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
// If this is a 16-bit signed immediate, fold it.
if (isInt16(Imm))
if (isInt16((int)Imm))
return SDOperand(CurDAG->getTargetNode(PPC::CMPWI, MVT::i32, LHS,
getI32Imm(Imm & 0xFFFF)), 0);