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translate: fix start_instance parameter in sse version

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The generic version gets this right already, but this was using an
incorrect formula in SSE.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: "11.2 12.0" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
This commit is contained in:
Ilia Mirkin 2016-06-19 00:43:06 -04:00
parent 35b53c8d47
commit 5b0d64886d
1 changed files with 7 additions and 7 deletions
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14
src/gallium/auxiliary/translate/translate_sse.c
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@ -1098,13 +1098,14 @@ init_inputs(struct translate_sse *p, unsigned index_size)
* base_ptr + stride * index, where index depends on instance divisor
*/
if (variant->instance_divisor) {
struct x86_reg tmp_EDX = p->tmp2_EDX;
/* Start with instance = instance_id
* which is true if divisor is 1.
*/
x86_mov(p->func, tmp_EAX, instance_id);
if (variant->instance_divisor != 1) {
struct x86_reg tmp_EDX = p->tmp2_EDX;
struct x86_reg tmp_ECX = p->src_ECX;
/* TODO: Add x86_shr() to rtasm and use it whenever
@ -1113,14 +1114,13 @@ init_inputs(struct translate_sse *p, unsigned index_size)
x86_xor(p->func, tmp_EDX, tmp_EDX);
x86_mov_reg_imm(p->func, tmp_ECX, variant->instance_divisor);
x86_div(p->func, tmp_ECX); /* EAX = EDX:EAX / ECX */
/* instance = (instance_id - start_instance) / divisor +
* start_instance
*/
x86_mov(p->func, tmp_EDX, start_instance);
x86_add(p->func, tmp_EAX, tmp_EDX);
}
/* instance = (instance_id / divisor) + start_instance
*/
x86_mov(p->func, tmp_EDX, start_instance);
x86_add(p->func, tmp_EAX, tmp_EDX);
/* XXX we need to clamp the index here too, but to a
* per-array max value, not the draw->pt.max_index value
* that's being given to us via translate->set_buffer().