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Update to use the new MathExtras.h support for log2 computation.

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Patch contributed by Jim Laskey!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22594 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2005-08-02 19:26:06 +00:00
parent 3b65576527
commit 0561b3ff9f
11 changed files with 108 additions and 188 deletions
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46
lib/Target/PowerPC/PPCISelPattern.cpp
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@@ -35,6 +35,29 @@
#include <algorithm>
using namespace llvm;
// IsRunOfOnes - returns true if Val consists of one contiguous run of 1's with
// any number of 0's on either side. the 1's are allowed to wrap from LSB to
// MSB. so 0x000FFF0, 0x0000FFFF, and 0xFF0000FF are all runs. 0x0F0F0000 is
// not, since all 1's are not contiguous.
static bool IsRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
if (isShiftedMask_32(Val)) {
// look for the first non-zero bit
MB = CountLeadingZeros_32(Val);
// look for the first zero bit after the run of ones
ME = CountLeadingZeros_32((Val - 1) ^ Val);
return true;
} else if (isShiftedMask_32(Val = ~Val)) { // invert mask
// effectively look for the first zero bit
ME = CountLeadingZeros_32(Val) - 1;
// effectively look for the first one bit after the run of zeros
MB = CountLeadingZeros_32((Val - 1) ^ Val) + 1;
return true;
}
// no run present
return false;
}
//===----------------------------------------------------------------------===//
// PPC32TargetLowering - PPC32 Implementation of the TargetLowering interface
namespace {
@@ -321,6 +344,7 @@ PPC32TargetLowering::LowerCallTo(SDOperand Chain,
// Just to be safe, we'll always reserve the full 24 bytes of linkage area
// plus 32 bytes of argument space in case any called code gets funky on us.
// (Required by ABI to support var arg)
if (NumBytes < 56) NumBytes = 56;
// Adjust the stack pointer for the new arguments...
@@ -664,36 +688,36 @@ static unsigned getImmediateForOpcode(SDOperand N, unsigned Opcode,
switch(Opcode) {
default: return 0;
case ISD::ADD:
if (v <= 32767 && v >= -32768) { Imm = v & 0xFFFF; return 1; }
if (isInt16(v)) { Imm = v & 0xFFFF; return 1; }
if ((v & 0x0000FFFF) == 0) { Imm = v >> 16; return 2; }
break;
case ISD::AND: {
unsigned MB, ME;
if (IsRunOfOnes(v, MB, ME)) { Imm = MB << 16 | ME & 0xFFFF; return 5; }
if (v >= 0 && v <= 65535) { Imm = v & 0xFFFF; return 1; }
if (isUInt16(v)) { Imm = v & 0xFFFF; return 1; }
if ((v & 0x0000FFFF) == 0) { Imm = v >> 16; return 2; }
break;
}
case ISD::XOR:
case ISD::OR:
if (v >= 0 && v <= 65535) { Imm = v & 0xFFFF; return 1; }
if (isUInt16(v)) { Imm = v & 0xFFFF; return 1; }
if ((v & 0x0000FFFF) == 0) { Imm = v >> 16; return 2; }
break;
case ISD::MUL:
if (v <= 32767 && v >= -32768) { Imm = v & 0xFFFF; return 1; }
if (isInt16(v)) { Imm = v & 0xFFFF; return 1; }
break;
case ISD::SUB:
// handle subtract-from separately from subtract, since subi is really addi
if (U && v <= 32767 && v >= -32768) { Imm = v & 0xFFFF; return 1; }
if (!U && v <= 32768 && v >= -32767) { Imm = (-v) & 0xFFFF; return 1; }
if (U && isInt16(v)) { Imm = v & 0xFFFF; return 1; }
if (!U && isInt16(-v)) { Imm = (-v) & 0xFFFF; return 1; }
break;
case ISD::SETCC:
if (U && (v >= 0 && v <= 65535)) { Imm = v & 0xFFFF; return 1; }
if (!U && (v <= 32767 && v >= -32768)) { Imm = v & 0xFFFF; return 1; }
if (U && isUInt16(v)) { Imm = v & 0xFFFF; return 1; }
if (!U && isInt16(v)) { Imm = v & 0xFFFF; return 1; }
break;
case ISD::SDIV:
if ((Imm = ExactLog2(v))) { return 3; }
if ((Imm = ExactLog2(-v))) { Imm = -Imm; return 3; }
if (isPowerOf2_32(v)) { Imm = Log2_32(v); return 3; }
if (isPowerOf2_32(-v)) { Imm = Log2_32(-v); return 3; }
if (v <= -2 || v >= 2) { return 4; }
break;
case ISD::UDIV:
@@ -807,7 +831,7 @@ struct mu {
static struct ms magic(int d) {
int p;
unsigned int ad, anc, delta, q1, r1, q2, r2, t;
const unsigned int two31 = 2147483648U; // 2^31
const unsigned int two31 = 0x80000000U;
struct ms mag;
ad = abs(d);