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i965/fs: Add and use get_nir_src_imm().

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The next patch wants to inspect the LOD argument and do something
different if it's 0.0f. But at that point we've emitted a MOV for it and
we just have a register to look at.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2016-05-04 15:10:25 -07:00
parent 8bf5493899
commit 07353599e0
2 changed files with 19 additions and 4 deletions
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1
src/mesa/drivers/dri/i965/brw_fs.h
View file

@ -257,6 +257,7 @@ public:
void nir_emit_jump(const brw::fs_builder &bld, void nir_emit_jump(const brw::fs_builder &bld,
nir_jump_instr *instr); nir_jump_instr *instr);
fs_reg get_nir_src(nir_src src); fs_reg get_nir_src(nir_src src);
fs_reg get_nir_src_imm(nir_src src);
fs_reg get_nir_dest(nir_dest dest); fs_reg get_nir_dest(nir_dest dest);
fs_reg get_nir_image_deref(const nir_deref_var *deref); fs_reg get_nir_image_deref(const nir_deref_var *deref);
fs_reg get_indirect_offset(nir_intrinsic_instr *instr); fs_reg get_indirect_offset(nir_intrinsic_instr *instr);

22
src/mesa/drivers/dri/i965/brw_fs_nir.cpp
View file

@ -1470,6 +1470,16 @@ fs_visitor::get_nir_src(nir_src src)
return retype(reg, BRW_REGISTER_TYPE_D); return retype(reg, BRW_REGISTER_TYPE_D);
} }
/**
* Return an IMM for constants; otherwise call get_nir_src() as normal.
*/
fs_reg
fs_visitor::get_nir_src_imm(nir_src src)
{
nir_const_value *val = nir_src_as_const_value(src);
return val ? fs_reg(brw_imm_d(val->i32[0])) : get_nir_src(src);
}
fs_reg fs_reg
fs_visitor::get_nir_dest(nir_dest dest) fs_visitor::get_nir_dest(nir_dest dest)
{ {
@ -4008,7 +4018,8 @@ fs_visitor::nir_emit_texture(const fs_builder &bld, nir_tex_instr *instr)
fs_reg src = get_nir_src(instr->src[i].src); fs_reg src = get_nir_src(instr->src[i].src);
switch (instr->src[i].src_type) { switch (instr->src[i].src_type) {
case nir_tex_src_bias: case nir_tex_src_bias:
srcs[TEX_LOGICAL_SRC_LOD] = retype(src, BRW_REGISTER_TYPE_F); srcs[TEX_LOGICAL_SRC_LOD] =
retype(get_nir_src_imm(instr->src[i].src), BRW_REGISTER_TYPE_F);
break; break;
case nir_tex_src_comparitor: case nir_tex_src_comparitor:
srcs[TEX_LOGICAL_SRC_SHADOW_C] = retype(src, BRW_REGISTER_TYPE_F); srcs[TEX_LOGICAL_SRC_SHADOW_C] = retype(src, BRW_REGISTER_TYPE_F);
@ -4036,13 +4047,16 @@ fs_visitor::nir_emit_texture(const fs_builder &bld, nir_tex_instr *instr)
case nir_tex_src_lod: case nir_tex_src_lod:
switch (instr->op) { switch (instr->op) {
case nir_texop_txs: case nir_texop_txs:
srcs[TEX_LOGICAL_SRC_LOD] = retype(src, BRW_REGISTER_TYPE_UD); srcs[TEX_LOGICAL_SRC_LOD] =
retype(get_nir_src_imm(instr->src[i].src), BRW_REGISTER_TYPE_UD);
break; break;
case nir_texop_txf: case nir_texop_txf:
srcs[TEX_LOGICAL_SRC_LOD] = retype(src, BRW_REGISTER_TYPE_D); srcs[TEX_LOGICAL_SRC_LOD] =
retype(get_nir_src_imm(instr->src[i].src), BRW_REGISTER_TYPE_D);
break; break;
default: default:
srcs[TEX_LOGICAL_SRC_LOD] = retype(src, BRW_REGISTER_TYPE_F); srcs[TEX_LOGICAL_SRC_LOD] =
retype(get_nir_src_imm(instr->src[i].src), BRW_REGISTER_TYPE_F);
break; break;
} }
break; break;