i965/nir: Use signed integer type for booleans

FS instructions with NIR on i965:
total instructions in shared programs: 2663561 -> 2619051 (-1.67%)
instructions in affected programs:     1612965 -> 1568455 (-2.76%)
helped:                                5455
HURT:                                  12

FS instructions with NIR on g4x:
total instructions in shared programs: 2352633 -> 2307908 (-1.90%)
instructions in affected programs:     1441842 -> 1397117 (-3.10%)
helped:                                5463
HURT:                                  11

FS instructions with NIR on ilk:
total instructions in shared programs: 3997305 -> 3934278 (-1.58%)
instructions in affected programs:     2189409 -> 2126382 (-2.88%)
helped:                                8969
HURT:                                  22

FS instructions with NIR on hsw (snb and ivb were similar):
total instructions in shared programs: 4109389 -> 4109242 (-0.00%)
instructions in affected programs:     109869 -> 109722 (-0.13%)
helped:                                339
HURT:                                  190

No SIMD16 programs were gained or lost on any platform

Reviewed-by: Matt Turner <mattst88@gmail.com>

diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
index 8507090..69f296c 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
@@ -522,7 +522,7 @@ fs_visitor::nir_emit_if(nir_if *if_stmt)
    /* first, put the condition into f0 */
    fs_inst *inst = emit(MOV(reg_null_d,
                             retype(get_nir_src(if_stmt->condition),
-                                   BRW_REGISTER_TYPE_UD)));
+                                   BRW_REGISTER_TYPE_D)));
    inst->conditional_mod = BRW_CONDITIONAL_NZ;
 
    emit(IF(BRW_PREDICATE_NORMAL));
@@ -598,9 +598,9 @@ static brw_reg_type
 brw_type_for_nir_type(nir_alu_type type)
 {
    switch (type) {
-   case nir_type_bool:
    case nir_type_unsigned:
       return BRW_REGISTER_TYPE_UD;
+   case nir_type_bool:
    case nir_type_int:
       return BRW_REGISTER_TYPE_D;
    case nir_type_float:
@@ -1279,7 +1279,7 @@ fs_visitor::nir_emit_alu(nir_alu_instr *instr)
       fs_reg masked = vgrf(glsl_type::int_type);
       emit(AND(masked, result, fs_reg(1)));
       masked.negate = true;
-      emit(MOV(result, masked));
+      emit(MOV(retype(result, BRW_REGISTER_TYPE_D), masked));
    }
 }