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i965: Add function to negate immediates.

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Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Matt Turner 2015-01-29 11:15:10 -08:00
parent 1f4bdad316
commit 638beee24a
2 changed files with 40 additions and 0 deletions
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39
src/mesa/drivers/dri/i965/brw_shader.cpp
View file

@ -620,6 +620,45 @@ brw_saturate_immediate(enum brw_reg_type type, struct brw_reg *reg)
return false;
}
bool
brw_negate_immediate(enum brw_reg_type type, struct brw_reg *reg)
{
switch (type) {
case BRW_REGISTER_TYPE_D:
reg->dw1.d = -reg->dw1.d;
return true;
case BRW_REGISTER_TYPE_W:
reg->dw1.d = -(int16_t)reg->dw1.ud;
return true;
case BRW_REGISTER_TYPE_F:
reg->dw1.f = -reg->dw1.f;
return true;
case BRW_REGISTER_TYPE_VF:
reg->dw1.ud ^= 0x80808080;
return true;
case BRW_REGISTER_TYPE_UB:
case BRW_REGISTER_TYPE_B:
unreachable("no UB/B immediates");
case BRW_REGISTER_TYPE_UD:
case BRW_REGISTER_TYPE_UW:
/* Presumably the negate modifier on an unsigned source is the same as
* on a signed source but it would be nice to confirm.
*/
assert(!"unimplemented: negate UD/UW immediate");
case BRW_REGISTER_TYPE_UV:
case BRW_REGISTER_TYPE_V:
assert(!"unimplemented: negate UV/V immediate");
case BRW_REGISTER_TYPE_UQ:
case BRW_REGISTER_TYPE_Q:
assert(!"unimplemented: negate UQ/Q immediate");
case BRW_REGISTER_TYPE_DF:
case BRW_REGISTER_TYPE_HF:
assert(!"unimplemented: negate DF/HF immediate");
}
return false;
}
backend_visitor::backend_visitor(struct brw_context *brw,
struct gl_shader_program *shader_prog,
struct gl_program *prog,

1
src/mesa/drivers/dri/i965/brw_shader.h
View file

@ -195,6 +195,7 @@ enum brw_conditional_mod brw_conditional_for_comparison(unsigned int op);
uint32_t brw_math_function(enum opcode op);
const char *brw_instruction_name(enum opcode op);
bool brw_saturate_immediate(enum brw_reg_type type, struct brw_reg *reg);
bool brw_negate_immediate(enum brw_reg_type type, struct brw_reg *reg);
#ifdef __cplusplus
extern "C" {