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optimization: emit MAD instructions when possible

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This commit is contained in:
Brian 2007-01-20 09:46:02 -07:00
parent 1f208c3546
commit f116fcc328
1 changed files with 50 additions and 10 deletions
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60
src/mesa/shader/slang/slang_emit.c
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@ -39,6 +39,8 @@
#include "slang_error.h"
#define PEEPHOLE_OPTIMIZATIONS 1
/**
* Assembly and IR info
*/
@ -450,16 +452,54 @@ emit_binop(slang_var_table *vt, slang_ir_node *n, struct gl_program *prog)
* replace with MAD instruction.
*/
/* gen code for children */
emit(vt, n->Children[0], prog);
emit(vt, n->Children[1], prog);
#if PEEPHOLE_OPTIMIZATIONS
/* Look for MAD opportunity */
if (n->Opcode == IR_ADD && n->Children[0]->Opcode == IR_MUL) {
/* found pattern IR_ADD(IR_MUL(A, B), C) */
emit(vt, n->Children[0]->Children[0], prog); /* A */
emit(vt, n->Children[0]->Children[1], prog); /* B */
emit(vt, n->Children[1], prog); /* C */
/* generate MAD instruction */
inst = new_instruction(prog, OPCODE_MAD);
/* operands: A, B, C: */
storage_to_src_reg(&inst->SrcReg[0], n->Children[0]->Children[0]->Store);
storage_to_src_reg(&inst->SrcReg[1], n->Children[0]->Children[1]->Store);
storage_to_src_reg(&inst->SrcReg[2], n->Children[1]->Store);
free_temp_storage(vt, n->Children[0]->Children[0]);
free_temp_storage(vt, n->Children[0]->Children[1]);
free_temp_storage(vt, n->Children[1]);
}
else if (n->Opcode == IR_ADD && n->Children[1]->Opcode == IR_MUL) {
/* found pattern IR_ADD(A, IR_MUL(B, C)) */
emit(vt, n->Children[0], prog); /* A */
emit(vt, n->Children[1]->Children[0], prog); /* B */
emit(vt, n->Children[1]->Children[1], prog); /* C */
/* generate MAD instruction */
inst = new_instruction(prog, OPCODE_MAD);
/* operands: B, C, A */
storage_to_src_reg(&inst->SrcReg[0], n->Children[1]->Children[0]->Store);
storage_to_src_reg(&inst->SrcReg[1], n->Children[1]->Children[1]->Store);
storage_to_src_reg(&inst->SrcReg[2], n->Children[0]->Store);
free_temp_storage(vt, n->Children[1]->Children[0]);
free_temp_storage(vt, n->Children[1]->Children[1]);
free_temp_storage(vt, n->Children[0]);
}
else
#endif
{
/* normal case */
/* gen this instruction */
inst = new_instruction(prog, info->InstOpcode);
storage_to_src_reg(&inst->SrcReg[0], n->Children[0]->Store);
storage_to_src_reg(&inst->SrcReg[1], n->Children[1]->Store);
free_temp_storage(vt, n->Children[0]);
free_temp_storage(vt, n->Children[1]);
/* gen code for children */
emit(vt, n->Children[0], prog);
emit(vt, n->Children[1], prog);
/* gen this instruction */
inst = new_instruction(prog, info->InstOpcode);
storage_to_src_reg(&inst->SrcReg[0], n->Children[0]->Store);
storage_to_src_reg(&inst->SrcReg[1], n->Children[1]->Store);
free_temp_storage(vt, n->Children[0]);
free_temp_storage(vt, n->Children[1]);
}
if (!n->Store) {
alloc_temp_storage(vt, n, info->ResultSize);
@ -623,7 +663,7 @@ emit_move(slang_var_table *vt, slang_ir_node *n, struct gl_program *prog)
/* lhs */
emit(vt, n->Children[0], prog);
#if 1
#if PEEPHOLE_OPTIMIZATIONS
if (inst && _slang_is_temp(vt, n->Children[1]->Store->Index)) {
/* Peephole optimization:
* Just modify the RHS to put its result into the dest of this