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optimization for the emit_not() function

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This commit is contained in:
Brian 2007-03-28 14:49:33 -06:00
parent 3b7f2f53a2
commit b2ac30ac36
1 changed files with 28 additions and 3 deletions
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31
src/mesa/shader/slang/slang_emit.c
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@ -1053,12 +1053,37 @@ emit_cond(slang_emit_info *emitInfo, slang_ir_node *n)
static struct prog_instruction *
emit_not(slang_emit_info *emitInfo, slang_ir_node *n)
{
static const struct {
gl_inst_opcode op, opNot;
} operators[] = {
{ OPCODE_SLT, OPCODE_SGE },
{ OPCODE_SLE, OPCODE_SGT },
{ OPCODE_SGT, OPCODE_SLE },
{ OPCODE_SGE, OPCODE_SLT },
{ OPCODE_SEQ, OPCODE_SNE },
{ OPCODE_SNE, OPCODE_SEQ },
{ 0, 0 }
};
struct prog_instruction *inst;
GLuint i;
/* child expr */
(void) emit(emitInfo, n->Children[0]);
/* XXXX if child instr is SGT convert to SLE, if SEQ, SNE, etc */
inst = emit(emitInfo, n->Children[0]);
#if PEEPHOLE_OPTIMIZATIONS
if (inst) {
/* if the prev instruction was a comparison instruction, invert it */
for (i = 0; operators[i].op; i++) {
if (inst->Opcode == operators[i].op) {
inst->Opcode = operators[i].opNot;
n->Store = n->Children[0]->Store;
return inst;
}
}
}
#endif
/* else, invert using SEQ (v = v == 0) */
if (!n->Store)
if (!alloc_temp_storage(emitInfo, n, n->Children[0]->Store->Size))
return NULL;
@ -1762,7 +1787,7 @@ _slang_emit_code(slang_ir_node *n, slang_var_table *vt,
emitInfo.NumSubroutines = 0;
emitInfo.EmitHighLevelInstructions = ctx->Shader.EmitHighLevelInstructions;
emitInfo.EmitCondCodes = 0*ctx->Shader.EmitCondCodes;
emitInfo.EmitCondCodes = ctx->Shader.EmitCondCodes;
emitInfo.EmitComments = ctx->Shader.EmitComments;
emitInfo.EmitBeginEndSub = 0; /* XXX for compiler debug only */