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Compile:

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uint %test(uint %X) {
        %Y = call uint %llvm.ctpop.i32(uint %X)
        ret uint %Y
}

to:

test:
        save -96, %o6, %o6
        sll %i0, 0, %l0
        popc %l0, %i0
        restore %g0, %g0, %g0
        retl
        nop

instead of to 40 logical ops.  Note the shift-by-zero that clears the top
part of the 64-bit V9 register.

Testcase here: CodeGen/SparcV8/ctpop.ll

llvm-svn: 25814
This commit is contained in:
Chris Lattner 2006-01-30 06:14:02 +00:00
parent 0551b3fcba
commit 7925da8b3b
2 changed files with 27 additions and 16 deletions
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35
lib/Target/SparcV8/SparcV8ISelDAGToDAG.cpp
View File

@ -33,21 +33,20 @@ using namespace llvm;
namespace V8ISD {
enum {
FIRST_NUMBER = ISD::BUILTIN_OP_END+V8::INSTRUCTION_LIST_END,
CMPICC, // Compare two GPR operands, set icc.
CMPFCC, // Compare two FP operands, set fcc.
BRICC, // Branch to dest on icc condition
BRFCC, // Branch to dest on fcc condition
CMPICC, // Compare two GPR operands, set icc.
CMPFCC, // Compare two FP operands, set fcc.
BRICC, // Branch to dest on icc condition
BRFCC, // Branch to dest on fcc condition
SELECT_ICC, // Select between two values using the current ICC flags.
SELECT_FCC, // Select between two values using the current FCC flags.
Hi, Lo, // Hi/Lo operations, typically on a global address.
Hi, Lo, // Hi/Lo operations, typically on a global address.
FTOI, // FP to Int within a FP register.
ITOF, // Int to FP within a FP register.
SELECT_ICC, // Select between two values using the current ICC flags.
SELECT_FCC, // Select between two values using the current FCC flags.
CALL, // A V8 call instruction.
RET_FLAG, // Return with a flag operand.
FTOI, // FP to Int within a FP register.
ITOF, // Int to FP within a FP register.
CALL, // A V8 call instruction.
RET_FLAG, // Return with a flag operand.
};
}
@ -173,10 +172,14 @@ SparcV8TargetLowering::SparcV8TargetLowering(TargetMachine &TM)
setOperationAction(ISD::VAEND , MVT::Other, Expand);
setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Expand);
setStackPointerRegisterToSaveRestore(V8::O6);
if (TM.getSubtarget<SparcV8Subtarget>().isV9()) {
setOperationAction(ISD::CTPOP, MVT::i32, Legal);
}
computeRegisterProperties();
}
@ -187,12 +190,12 @@ const char *SparcV8TargetLowering::getTargetNodeName(unsigned Opcode) const {
case V8ISD::CMPFCC: return "V8ISD::CMPFCC";
case V8ISD::BRICC: return "V8ISD::BRICC";
case V8ISD::BRFCC: return "V8ISD::BRFCC";
case V8ISD::SELECT_ICC: return "V8ISD::SELECT_ICC";
case V8ISD::SELECT_FCC: return "V8ISD::SELECT_FCC";
case V8ISD::Hi: return "V8ISD::Hi";
case V8ISD::Lo: return "V8ISD::Lo";
case V8ISD::FTOI: return "V8ISD::FTOI";
case V8ISD::ITOF: return "V8ISD::ITOF";
case V8ISD::SELECT_ICC: return "V8ISD::SELECT_ICC";
case V8ISD::SELECT_FCC: return "V8ISD::SELECT_FCC";
case V8ISD::CALL: return "V8ISD::CALL";
case V8ISD::RET_FLAG: return "V8ISD::RET_FLAG";
}

8
lib/Target/SparcV8/SparcV8InstrInfo.td
View File

@ -764,6 +764,14 @@ let Predicates = [HasV9] in {
[(set DFPRegs:$dst, (fabs DFPRegs:$src))]>;
}
// POPCrr - This does a ctpop of a 64-bit register. As such, we have to clear
// the top 32-bits before using it. To do this clearing, we use a SLLri X,0.
def POPCrr : F3_1<2, 0b101110,
(ops IntRegs:$dst, IntRegs:$src),
"popc $src, $dst", []>, Requires<[HasV9]>;
def : Pat<(ctpop IntRegs:$src),
(POPCrr (SLLri IntRegs:$src, 0))>;
//===----------------------------------------------------------------------===//
// Non-Instruction Patterns
//===----------------------------------------------------------------------===//