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- Fix a small bug while handling target constant pools (one param was missing).

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- Add a smarter constant pool loading, instead of:

lui $2, %hi($CPI1_0)
addiu $2, $2, %lo($CPI1_0)
lwc1 $f0, 0($2)

Generate:

lui $2, %hi($CPI1_0)
lwc1 $f0, %lo($CPI1_0)($2)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88886 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes 2009-11-16 04:33:42 +00:00
parent d6add155a7
commit 6e0b658dad
3 changed files with 32 additions and 1 deletions
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21
lib/Target/Mips/MipsISelDAGToDAG.cpp
View File

@ -170,6 +170,27 @@ SelectAddr(SDValue Op, SDValue Addr, SDValue &Offset, SDValue &Base)
return true;
}
}
// When loading from constant pools, load the lower address part in
// the instruction itself. Instead of:
// lui $2, %hi($CPI1_0)
// addiu $2, $2, %lo($CPI1_0)
// lwc1 $f0, 0($2)
// Generate:
// lui $2, %hi($CPI1_0)
// lwc1 $f0, %lo($CPI1_0)($2)
if (Addr.getOperand(0).getOpcode() == MipsISD::Hi &&
Addr.getOperand(1).getOpcode() == MipsISD::Lo) {
SDValue LoVal = Addr.getOperand(1);
if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(
LoVal.getOperand(0))) {
if (!CP->getOffset()) {
Base = Addr.getOperand(0);
Offset = LoVal.getOperand(0);
return true;
}
}
}
}
Base = Addr;

2
lib/Target/Mips/MipsISelLowering.cpp
View File

@ -568,7 +568,7 @@ LowerConstantPool(SDValue Op, SelectionDAG &DAG)
ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op);
Constant *C = N->getConstVal();
SDValue CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment(),
MipsII::MO_ABS_HILO);
N->getOffset(), MipsII::MO_ABS_HILO);
// FIXME there isn't actually debug info here
DebugLoc dl = Op.getDebugLoc();

10
test/CodeGen/Mips/2009-11-16-CstPoolLoad.ll Normal file
View File

@ -0,0 +1,10 @@
; RUN: llc < %s | FileCheck %s
target datalayout = "E-p:32:32:32-i1:8:8-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-n32"
target triple = "mips-unknown-linux"
define float @h() nounwind readnone {
entry:
; CHECK: lui $2, %hi($CPI1_0)
; CHECK: lwc1 $f0, %lo($CPI1_0)($2)
ret float 0x400B333340000000
}