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fold immediate of a + Const into the user as a subtract if it can fit as a negated two-part immediate.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89694 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2009-11-23 20:35:53 +00:00
parent b16ed11cb4
commit 15e6ef886d
2 changed files with 37 additions and 6 deletions
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22
lib/Target/ARM/ARMInstrInfo.td
View File

@ -284,6 +284,22 @@ def so_imm2part_2 : SDNodeXForm<imm, [{
return CurDAG->getTargetConstant(V, MVT::i32);
}]>;
def so_neg_imm2part : Operand<i32>, PatLeaf<(imm), [{
return ARM_AM::isSOImmTwoPartVal(-(int)N->getZExtValue());
}]> {
let PrintMethod = "printSOImm2PartOperand";
}
def so_neg_imm2part_1 : SDNodeXForm<imm, [{
unsigned V = ARM_AM::getSOImmTwoPartFirst(-(int)N->getZExtValue());
return CurDAG->getTargetConstant(V, MVT::i32);
}]>;
def so_neg_imm2part_2 : SDNodeXForm<imm, [{
unsigned V = ARM_AM::getSOImmTwoPartSecond(-(int)N->getZExtValue());
return CurDAG->getTargetConstant(V, MVT::i32);
}]>;
/// imm0_31 predicate - True if the 32-bit immediate is in the range [0,31].
def imm0_31 : Operand<i32>, PatLeaf<(imm), [{
return (int32_t)N->getZExtValue() < 32;
@ -1618,9 +1634,9 @@ def : ARMPat<(xor GPR:$LHS, so_imm2part:$RHS),
def : ARMPat<(add GPR:$LHS, so_imm2part:$RHS),
(ADDri (ADDri GPR:$LHS, (so_imm2part_1 imm:$RHS)),
(so_imm2part_2 imm:$RHS))>;
def : ARMPat<(sub GPR:$LHS, so_imm2part:$RHS),
(SUBri (SUBri GPR:$LHS, (so_imm2part_1 imm:$RHS)),
(so_imm2part_2 imm:$RHS))>;
def : ARMPat<(add GPR:$LHS, so_neg_imm2part:$RHS),
(SUBri (SUBri GPR:$LHS, (so_neg_imm2part_1 imm:$RHS)),
(so_neg_imm2part_2 imm:$RHS))>;
// 32-bit immediate using movw + movt.
// This is a single pseudo instruction, the benefit is that it can be remat'd

21
lib/Target/ARM/ARMInstrThumb2.td
View File

@ -88,6 +88,21 @@ def t2_so_imm2part_2 : SDNodeXForm<imm, [{
return CurDAG->getTargetConstant(V, MVT::i32);
}]>;
def t2_so_neg_imm2part : Operand<i32>, PatLeaf<(imm), [{
return ARM_AM::isT2SOImmTwoPartVal(-(int)N->getZExtValue());
}]> {
}
def t2_so_neg_imm2part_1 : SDNodeXForm<imm, [{
unsigned V = ARM_AM::getT2SOImmTwoPartFirst(-(int)N->getZExtValue());
return CurDAG->getTargetConstant(V, MVT::i32);
}]>;
def t2_so_neg_imm2part_2 : SDNodeXForm<imm, [{
unsigned V = ARM_AM::getT2SOImmTwoPartSecond(-(int)N->getZExtValue());
return CurDAG->getTargetConstant(V, MVT::i32);
}]>;
/// imm1_31 predicate - True if the 32-bit immediate is in the range [1,31].
def imm1_31 : PatLeaf<(i32 imm), [{
return (int32_t)N->getZExtValue() >= 1 && (int32_t)N->getZExtValue() < 32;
@ -1162,9 +1177,9 @@ def : T2Pat<(xor GPR:$LHS, t2_so_imm2part:$RHS),
def : T2Pat<(add GPR:$LHS, t2_so_imm2part:$RHS),
(t2ADDri (t2ADDri GPR:$LHS, (t2_so_imm2part_1 imm:$RHS)),
(t2_so_imm2part_2 imm:$RHS))>;
def : T2Pat<(sub GPR:$LHS, t2_so_imm2part:$RHS),
(t2SUBri (t2SUBri GPR:$LHS, (t2_so_imm2part_1 imm:$RHS)),
(t2_so_imm2part_2 imm:$RHS))>;
def : T2Pat<(add GPR:$LHS, t2_so_neg_imm2part:$RHS),
(t2SUBri (t2SUBri GPR:$LHS, (t2_so_neg_imm2part_1 imm:$RHS)),
(t2_so_neg_imm2part_2 imm:$RHS))>;
// ConstantPool, GlobalAddress, and JumpTable
def : T2Pat<(ARMWrapper tglobaladdr :$dst), (t2LEApcrel tglobaladdr :$dst)>;