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Cleanup implementation of target builtins code.

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- Renamed stdlib-sse.ll to builtins-sse.ll (etc.) in an attempt to better indicate
the fact that the stuff in those files has a role beyond implementing stuff for
the standard library.
- Moved declarations of the various __pseudo_* functions from being done with LLVM
API calls in builtins.cpp to just straight up declarations in LLVM assembly
language in builtins.m4.  (Much less code to do it this way, and more clear what's
going on.)
This commit is contained in:
Matt Pharr
2011-08-01 05:58:43 +01:00
parent 2d52c732f1
commit a552927a6a
13 changed files with 163 additions and 351 deletions
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141
builtins-c.c Normal file
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/*
Copyright (c) 2010-2011, Intel Corporation
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of Intel Corporation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @file builtins-c.c
@brief Standard library function implementations written in C.
This file provides C implementations of various functions that can be
called from ispc programs; in other words, this file is *not* linked
into the ispc compiler executable, but rather provides functions that
can be compiled into ispc programs.
When the ispc compiler is built, this file is compiled with clang to
generate LLVM bitcode. This bitcode is later linked in to the program
being compiled by the DefineStdlib() function. The first way to access
definitions from this file is by asking for them name from the
llvm::Module's' symbol table (e.g. as the PrintStmt implementation does
with __do_print() below. Alternatively, if a function defined in this
file has a signature that can be mapped back to ispc types by the
lLLVMTypeToIspcType() function, then its declaration will be made
available to ispc programs at compile time automatically.
*/
#include <stdint.h>
#include <stdio.h>
#include <stdarg.h>
typedef int Bool;
#define PRINT_SCALAR(fmt, type) \
printf(fmt, *((type *)ptr)); \
break
#define PRINT_VECTOR(fmt, type) \
putchar('['); \
for (int i = 0; i < width; ++i) { \
/* only print the value if the current lane is executing */ \
if (mask & (1<<i)) \
printf(fmt, ((type *)ptr)[i]); \
else \
printf("((" fmt "))", ((type *)ptr)[i]); \
putchar(i != width-1 ? ',' : ']'); \
} \
break
/** This function is called by PrintStmt to do the work of printing values
from ispc programs. Note that the function signature here must match
the parameters that PrintStmt::EmitCode() generates.
@param format Print format string
@param types Encoded types of the values being printed.
(See lEncodeType()).
@param width Vector width of the compilation target
@param mask Current lane mask when the print statemnt is called
@param args Array of pointers to the values to be printed
*/
void __do_print(const char *format, const char *types, int width, int mask,
void **args) {
if (mask == 0)
return;
int argCount = 0;
while (*format) {
// Format strings are just single percent signs.
if (*format != '%')
putchar(*format);
else {
if (*types) {
void *ptr = args[argCount++];
// Based on the encoding in the types string, cast the
// value appropriately and print it with a reasonable
// printf() formatting string.
switch (*types) {
case 'b': {
printf("%s", *((Bool *)ptr) ? "true" : "false");
break;
}
case 'B': {
putchar('[');
for (int i = 0; i < width; ++i) {
if (mask & (1<<i))
printf("%s", ((Bool *)ptr)[i] ? "true" : "false");
else
printf("_________");
putchar(i != width-1 ? ',' : ']');
}
break;
}
case 'i': PRINT_SCALAR("%d", int);
case 'I': PRINT_VECTOR("%d", int);
case 'u': PRINT_SCALAR("%u", unsigned int);
case 'U': PRINT_VECTOR("%u", unsigned int);
case 'f': PRINT_SCALAR("%f", float);
case 'F': PRINT_VECTOR("%f", float);
case 'l': PRINT_SCALAR("%lld", long long);
case 'L': PRINT_VECTOR("%lld", long long);
case 'v': PRINT_SCALAR("%llu", unsigned long long);
case 'V': PRINT_VECTOR("%llu", unsigned long long);
case 'd': PRINT_SCALAR("%f", double);
case 'D': PRINT_VECTOR("%f", double);
default:
printf("UNKNOWN TYPE ");
putchar(*types);
}
++types;
}
}
++format;
}
fflush(stdout);
}