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/*
* Copyright 2012 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Author: Tom Stellard <thomas.stellard@amd.com>
*/
#include "radeon_compiler.h"
#include "radeon_compiler_util.h"
#include "radeon_dataflow.h"
#include "radeon_program.h"
#include "radeon_program_constants.h"
#include "util/u_bitcast.h"
#include <stdio.h>
#define VERBOSE 0
#define DBG(...) do { if (VERBOSE) fprintf(stderr, __VA_ARGS__); } while(0)
/* IEEE-754:
* 22:0 mantissa
* 30:23 exponent
* 31 sign
*
* R300:
* 0:2 mantissa
* 3:6 exponent (bias 7)
*/
static int ieee_754_to_r300_float(float f, unsigned char *r300_float_out)
{
unsigned float_bits = u_bitcast_f2u(f);
/* XXX: Handle big-endian */
unsigned mantissa = float_bits & 0x007fffff;
unsigned biased_exponent = (float_bits & 0x7f800000) >> 23;
unsigned negate = !!(float_bits & 0x80000000);
int exponent = biased_exponent - 127;
unsigned mantissa_mask = 0xff8fffff;
unsigned r300_exponent, r300_mantissa;
DBG("Converting %f (0x%x) to 7-bit:\n", f, float_bits);
DBG("Raw exponent = %d\n", exponent);
if (exponent < -7 || exponent > 8) {
DBG("Failed exponent out of range\n\n");
return 0;
}
if (mantissa & mantissa_mask) {
DBG("Failed mantisa has too many bits:\n"
"manitssa=0x%x mantissa_mask=0x%x, and=0x%x\n\n",
mantissa, mantissa_mask,
mantissa & mantissa_mask);
return 0;
}
r300_exponent = exponent + 7;
r300_mantissa = (mantissa & ~mantissa_mask) >> 20;
*r300_float_out = r300_mantissa | (r300_exponent << 3);
DBG("Success! r300_float = 0x%x\n\n", *r300_float_out);
if (negate)
return -1;
else
return 1;
}
void rc_inline_literals(struct radeon_compiler *c, void *user)
{
struct rc_instruction * inst;
for(inst = c->Program.Instructions.Next;
inst != &c->Program.Instructions;
inst = inst->Next) {
const struct rc_opcode_info * info =
rc_get_opcode_info(inst->U.I.Opcode);
unsigned src_idx;
struct rc_constant * constant;
float float_value;
unsigned char r300_float = 0;
int ret;
/* XXX: Handle presub */
/* We aren't using rc_for_all_reads_src here, because presub
* sources need to be handled differently. */
for (src_idx = 0; src_idx < info->NumSrcRegs; src_idx++) {
unsigned new_swizzle;
unsigned use_literal = 0;
unsigned negate_mask = 0;
unsigned swz, chan;
struct rc_src_register * src_reg =
&inst->U.I.SrcReg[src_idx];
swz = RC_SWIZZLE_UNUSED;
if (src_reg->File != RC_FILE_CONSTANT) {
continue;
}
constant =
&c->Program.Constants.Constants[src_reg->Index];
if (constant->Type != RC_CONSTANT_IMMEDIATE) {
continue;
}
new_swizzle = rc_init_swizzle(RC_SWIZZLE_UNUSED, 0);
for (chan = 0; chan < 4; chan++) {
unsigned char r300_float_tmp;
swz = GET_SWZ(src_reg->Swizzle, chan);
if (swz == RC_SWIZZLE_UNUSED) {
continue;
}
float_value = constant->u.Immediate[swz];
ret = ieee_754_to_r300_float(float_value,
&r300_float_tmp);
if (!ret || (use_literal &&
r300_float != r300_float_tmp)) {
use_literal = 0;
break;
}
if (ret == -1 && src_reg->Abs) {
use_literal = 0;
break;
}
if (!use_literal) {
r300_float = r300_float_tmp;
use_literal = 1;
}
/* Use RC_SWIZZLE_W for the inline constant, so
* it will become one of the alpha sources. */
SET_SWZ(new_swizzle, chan, RC_SWIZZLE_W);
if (ret == -1) {
negate_mask |= (1 << chan);
}
}
if (!use_literal) {
continue;
}
src_reg->File = RC_FILE_INLINE;
src_reg->Index = r300_float;
src_reg->Swizzle = new_swizzle;
src_reg->Negate = src_reg->Negate ^ negate_mask;
}
}
}
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