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i915g: Use the actual MIN instruction. 

Matt Turner noticed that the hardware has always had a MIN
instruction, but the driver always used MAX+MOV for no
apparent reason.

This should cut an instruction, and a temporary, allowing
more programs to run in hardware.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Kenneth Graunke 2015-02-10 03:36:47 -08:00
parent 27b6ef7eca
commit 7bf774034a
1 changed files with 1 additions and 15 deletions
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16
src/gallium/drivers/i915/i915_fpc_translate.c
View File

@ -764,21 +764,7 @@ i915_translate_instruction(struct i915_fp_compile *p,
break;
case TGSI_OPCODE_MIN:
src0 = src_vector(p, &inst->Src[0], fs);
src1 = src_vector(p, &inst->Src[1], fs);
tmp = i915_get_utemp(p);
flags = get_result_flags(inst);
i915_emit_arith(p,
A0_MAX,
tmp, flags & A0_DEST_CHANNEL_ALL, 0,
negate(src0, 1, 1, 1, 1),
negate(src1, 1, 1, 1, 1), 0);
i915_emit_arith(p,
A0_MOV,
get_result_vector(p, &inst->Dst[0]),
flags, 0, negate(tmp, 1, 1, 1, 1), 0, 0);
emit_simple_arith(p, inst, A0_MIN, 2, fs);
break;
case TGSI_OPCODE_MOV: