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i965: Add EU code for dword scattered reads (constant buffer array indexing).

This commit is contained in:
Eric Anholt 2010-10-25 11:23:13 -07:00
parent 547e7619aa
commit 3789d5025a
2 changed files with 45 additions and 0 deletions
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5
src/mesa/drivers/dri/i965/brw_eu.h
View File

@ -914,6 +914,11 @@ void brw_oword_block_write_scratch(struct brw_compile *p,
int num_regs,
GLuint offset);
void brw_dword_scattered_read(struct brw_compile *p,
struct brw_reg dest,
struct brw_reg mrf,
uint32_t bind_table_index);
void brw_dp_READ_4_vs( struct brw_compile *p,
struct brw_reg dest,
GLuint location,

40
src/mesa/drivers/dri/i965/brw_eu_emit.c
View File

@ -1566,6 +1566,46 @@ void brw_oword_block_read(struct brw_compile *p,
brw_pop_insn_state(p);
}
/**
* Read a set of dwords from the data port Data Cache (const buffer).
*
* Location (in buffer) appears as UD offsets in the register after
* the provided mrf header reg.
*/
void brw_dword_scattered_read(struct brw_compile *p,
struct brw_reg dest,
struct brw_reg mrf,
uint32_t bind_table_index)
{
mrf = retype(mrf, BRW_REGISTER_TYPE_UD);
brw_push_insn_state(p);
brw_set_predicate_control(p, BRW_PREDICATE_NONE);
brw_set_compression_control(p, BRW_COMPRESSION_NONE);
brw_set_mask_control(p, BRW_MASK_DISABLE);
brw_MOV(p, mrf, retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UD));
brw_pop_insn_state(p);
struct brw_instruction *insn = next_insn(p, BRW_OPCODE_SEND);
insn->header.destreg__conditionalmod = mrf.nr;
/* cast dest to a uword[8] vector */
dest = retype(vec8(dest), BRW_REGISTER_TYPE_UW);
brw_set_dest(insn, dest);
brw_set_src0(insn, brw_null_reg());
brw_set_dp_read_message(p->brw,
insn,
bind_table_index,
BRW_DATAPORT_DWORD_SCATTERED_BLOCK_8DWORDS,
BRW_DATAPORT_READ_MESSAGE_DWORD_SCATTERED_READ,
0, /* source cache = data cache */
2, /* msg_length */
1, /* response_length */
0); /* eot */
}
/**