forked from OSchip/llvm-project
92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
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//===-- NVPTXutil.cpp - Functions exported to CodeGen --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the functions that can be used in CodeGen.
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//
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//===----------------------------------------------------------------------===//
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#include "NVPTXutil.h"
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#include "NVPTX.h"
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using namespace llvm;
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namespace llvm {
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bool isParamLoad(const MachineInstr *MI)
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{
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if ((MI->getOpcode() != NVPTX::LD_i32_avar) &&
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(MI->getOpcode() != NVPTX::LD_i64_avar))
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return false;
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if (MI->getOperand(2).isImm() == false)
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return false;
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if (MI->getOperand(2).getImm() != NVPTX::PTXLdStInstCode::PARAM)
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return false;
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return true;
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}
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#define DATA_MASK 0x7f
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#define DIGIT_WIDTH 7
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#define MORE_BYTES 0x80
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static int encode_leb128(uint64_t val, int *nbytes,
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char *space, int splen)
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{
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char *a;
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char *end = space + splen;
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a = space;
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do {
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unsigned char uc;
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if (a >= end)
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return 1;
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uc = val & DATA_MASK;
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val >>= DIGIT_WIDTH;
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if (val != 0)
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uc |= MORE_BYTES;
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*a = uc;
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a++;
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} while (val);
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*nbytes = a - space;
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return 0;
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}
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#undef DATA_MASK
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#undef DIGIT_WIDTH
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#undef MORE_BYTES
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uint64_t encode_leb128(const char *str)
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{
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union { uint64_t x; char a[8]; } temp64;
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temp64.x = 0;
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for (unsigned i=0,e=strlen(str); i!=e; ++i)
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temp64.a[i] = str[e-1-i];
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char encoded[16];
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int nbytes;
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int retval = encode_leb128(temp64.x, &nbytes, encoded, 16);
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assert(retval == 0 &&
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"Encoding to leb128 failed");
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assert(nbytes <= 8 &&
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"Cannot support register names with leb128 encoding > 8 bytes");
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temp64.x = 0;
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for (int i=0; i<nbytes; ++i)
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temp64.a[i] = encoded[i];
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return temp64.x;
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}
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} // end namespace llvm
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