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authorBrian <brian@yutani.localnet.net>2007-03-28 14:49:33 -0600
committerBrian <brian@yutani.localnet.net>2007-03-28 14:49:33 -0600
commitb2ac30ac36c66122d6d8a73e7057a84b74c3d930 (patch)
tree1db85a1ce11f71b8aefa6cfd524a49631aed099f /src/mesa/shader/slang
parent3b7f2f53a222b06ca14fff44b5e1143e1b41e390 (diff)
optimization for the emit_not() function
Diffstat (limited to 'src/mesa/shader/slang')
-rw-r--r--src/mesa/shader/slang/slang_emit.c31
1 files changed, 28 insertions, 3 deletions
diff --git a/src/mesa/shader/slang/slang_emit.c b/src/mesa/shader/slang/slang_emit.c
index b5a2dfaafc..b00ab3c7bf 100644
--- a/src/mesa/shader/slang/slang_emit.c
+++ b/src/mesa/shader/slang/slang_emit.c
@@ -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 */