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i965/vec4: Allow constant propagation of VF immediates.

Browse source 
total instructions in shared programs: 5877951 -> 5877012 (-0.02%)
instructions in affected programs:     155923 -> 154984 (-0.60%)

Helps 1233, hurts 156 shaders. The hurt shaders are addressed in the
next commit.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Matt Turner 2014-12-20 17:42:52 -08:00
parent c855f49c99
commit d61c519822
1 changed files with 27 additions and 1 deletions
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28
src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
View file

@ -50,7 +50,9 @@ is_direct_copy(vec4_instruction *inst)
inst->dst.file == GRF &&
!inst->dst.reladdr &&
!inst->src[0].reladdr &&
inst->dst.type == inst->src[0].type);
(inst->dst.type == inst->src[0].type ||
(inst->dst.type == BRW_REGISTER_TYPE_F &&
inst->src[0].type == BRW_REGISTER_TYPE_VF)));
}
static bool
@ -77,6 +79,22 @@ is_channel_updated(vec4_instruction *inst, src_reg *values[4], int ch)
inst->dst.writemask & (1 << BRW_GET_SWZ(src->swizzle, ch)));
}
static unsigned
swizzle_vf_imm(unsigned vf4, unsigned swizzle)
{
union {
unsigned vf4;
uint8_t vf[4];
} v = { vf4 }, ret;
ret.vf[0] = v.vf[BRW_GET_SWZ(swizzle, 0)];
ret.vf[1] = v.vf[BRW_GET_SWZ(swizzle, 1)];
ret.vf[2] = v.vf[BRW_GET_SWZ(swizzle, 2)];
ret.vf[3] = v.vf[BRW_GET_SWZ(swizzle, 3)];
return ret.vf4;
}
static bool
try_constant_propagate(struct brw_context *brw, vec4_instruction *inst,
int arg, struct copy_entry *entry)
@ -98,6 +116,8 @@ try_constant_propagate(struct brw_context *brw, vec4_instruction *inst,
if (inst->src[arg].abs) {
if (value.type == BRW_REGISTER_TYPE_F) {
value.fixed_hw_reg.dw1.f = fabs(value.fixed_hw_reg.dw1.f);
} else if (value.type == BRW_REGISTER_TYPE_VF) {
value.fixed_hw_reg.dw1.ud &= ~0x80808080;
} else if (value.type == BRW_REGISTER_TYPE_D) {
if (value.fixed_hw_reg.dw1.d < 0)
value.fixed_hw_reg.dw1.d = -value.fixed_hw_reg.dw1.d;
@ -107,10 +127,16 @@ try_constant_propagate(struct brw_context *brw, vec4_instruction *inst,
if (inst->src[arg].negate) {
if (value.type == BRW_REGISTER_TYPE_F)
value.fixed_hw_reg.dw1.f = -value.fixed_hw_reg.dw1.f;
else if (value.type == BRW_REGISTER_TYPE_VF)
value.fixed_hw_reg.dw1.ud ^= 0x80808080;
else
value.fixed_hw_reg.dw1.ud = -value.fixed_hw_reg.dw1.ud;
}
if (value.type == BRW_REGISTER_TYPE_VF)
value.fixed_hw_reg.dw1.ud = swizzle_vf_imm(value.fixed_hw_reg.dw1.ud,
inst->src[arg].swizzle);
switch (inst->opcode) {
case BRW_OPCODE_MOV:
inst->src[arg] = value;