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r600g: fix and optimize tgsi_cmp when using ABS and NEG modifier

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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 <siro@das-labor.org>
Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Patrick Rudolph 2016-03-28 11:52:00 +02:00 • committed by Dave Airlie
parent 7aa3a93656
commit fb5d38e219
1 changed files with 10 additions and 1 deletions
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11
src/gallium/drivers/r600/r600_shader.c
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@ -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;