From: Patrick Rudolph <s...@das-labor.org>
Some apps set NEG and ABS on the source param to test for zero.
Use ALU_OP3_CNDE insted of ALU_OP3_CNDGE and unset both modifiers.
It also removes the need for a MOV instruction, as ABS isn't
supported on op3.
Tested on AMD CAYMAN and AMD RV770.
Signed-off-by: Patrick Rudolph <s...@das-labor.org>
---
src/gallium/drivers/r600/r600_shader.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/src/gallium/drivers/r600/r600_shader.c
b/src/gallium/drivers/r600/r600_shader.c
index 77658f5..e5e2e3f 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -7707,6 +7707,15 @@ static int tgsi_cmp(struct r600_shader_ctx *ctx)
int i, r, j;
int lasti = tgsi_last_instruction(inst->Dst[0].Register.WriteMask);
int temp_regs[3];
+ unsigned op;
+
+ if (ctx->src[0].abs && ctx->src[0].neg) {
+ op = ALU_OP3_CNDE;
+ ctx->src[0].abs = 0;
+ ctx->src[0].neg = 0;
+ } else {
+ op = ALU_OP3_CNDGE;
+ }
for (j = 0; j < inst->Instruction.NumSrcRegs; j++) {
temp_regs[j] = 0;
@@ -7719,7 +7728,7 @@ static int tgsi_cmp(struct r600_shader_ctx *ctx)
continue;
memset(&alu, 0, sizeof(struct r600_bytecode_alu));
- alu.op = ALU_OP3_CNDGE;
+ alu.op = op;
r = tgsi_make_src_for_op3(ctx, temp_regs[0], i, &alu.src[0],
&ctx->src[0]);
if (r)
return r;
--
2.5.0
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/mesa-dev
