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Codegen ADD X, IMM -> addis/addi if needed.

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This implements PowerPC/fold-li.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23514 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-28 23:07:13 +00:00
parent 3a972c2951
commit 79d0e9f3d1
1 changed files with 12 additions and 2 deletions
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14
lib/Target/PowerPC/PPCInstrInfo.td
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@ -218,6 +218,13 @@ def HI16 : SDNodeXForm<imm, [{
return getI32Imm((unsigned)N->getValue() >> 16);
}]>;
def HA16 : SDNodeXForm<imm, [{
// Transformation function: shift the immediate value down into the low bits.
signed int Val = N->getValue();
return getI32Imm((Val - (signed short)Val) >> 16);
}]>;
def immSExt16 : PatLeaf<(imm), [{
// immSExt16 predicate - True if the immediate fits in a 16-bit sign extended
// field. Used by instructions like 'addi'.
@ -801,10 +808,13 @@ def EQV1 : Pat<(xor (not GPRC:$in1), GPRC:$in2),
def EQV2 : Pat<(xor GPRC:$in1, (not GPRC:$in2)),
(EQV GPRC:$in1, GPRC:$in2)>;
// or by an arbitrary immediate.
// ADD an arbitrary immediate.
def : Pat<(add GPRC:$in, imm:$imm),
(ADDIS (ADDI GPRC:$in, (LO16 imm:$imm)), (HA16 imm:$imm))>;
// OR an arbitrary immediate.
def : Pat<(or GPRC:$in, imm:$imm),
(ORIS (ORI GPRC:$in, (LO16 imm:$imm)), (HI16 imm:$imm))>;
// xor by an arbitrary immediate.
// XOR an arbitrary immediate.
def : Pat<(xor GPRC:$in, imm:$imm),
(XORIS (XORI GPRC:$in, (LO16 imm:$imm)), (HI16 imm:$imm))>;