diff options
Diffstat (limited to 'mesalib/src/glsl/lower_instructions.cpp')
| -rw-r--r-- | mesalib/src/glsl/lower_instructions.cpp | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/mesalib/src/glsl/lower_instructions.cpp b/mesalib/src/glsl/lower_instructions.cpp index 1ce7b7c9d..d32ec80d6 100644 --- a/mesalib/src/glsl/lower_instructions.cpp +++ b/mesalib/src/glsl/lower_instructions.cpp @@ -38,6 +38,7 @@ * - LOG_TO_LOG2 * - MOD_TO_FRACT * - LRP_TO_ARITH + * - BITFIELD_INSERT_TO_BFM_BFI * * SUB_TO_ADD_NEG: * --------------- @@ -84,6 +85,15 @@ * LRP_TO_ARITH: * ------------- * Converts ir_triop_lrp to (op0 * (1.0f - op2)) + (op1 * op2). + * + * BITFIELD_INSERT_TO_BFM_BFI: + * --------------------------- + * Breaks ir_quadop_bitfield_insert into ir_binop_bfm (bitfield mask) and + * ir_triop_bfi (bitfield insert). + * + * Many GPUs implement the bitfieldInsert() built-in from ARB_gpu_shader_5 + * with a pair of instructions. + * */ #include "main/core.h" /* for M_LOG2E */ @@ -114,6 +124,7 @@ private: void pow_to_exp2(ir_expression *); void log_to_log2(ir_expression *); void lrp_to_arith(ir_expression *); + void bitfield_insert_to_bfm_bfi(ir_expression *); }; /** @@ -298,6 +309,29 @@ lower_instructions_visitor::lrp_to_arith(ir_expression *ir) this->progress = true; } +void +lower_instructions_visitor::bitfield_insert_to_bfm_bfi(ir_expression *ir) +{ + /* Translates + * ir_quadop_bitfield_insert base insert offset bits + * into + * ir_triop_bfi (ir_binop_bfm bits offset) insert base + */ + + ir_rvalue *base_expr = ir->operands[0]; + + ir->operation = ir_triop_bfi; + ir->operands[0] = new(ir) ir_expression(ir_binop_bfm, + ir->type->get_base_type(), + ir->operands[3], + ir->operands[2]); + /* ir->operands[1] is still the value to insert. */ + ir->operands[2] = base_expr; + ir->operands[3] = NULL; + + this->progress = true; +} + ir_visitor_status lower_instructions_visitor::visit_leave(ir_expression *ir) { @@ -339,6 +373,11 @@ lower_instructions_visitor::visit_leave(ir_expression *ir) lrp_to_arith(ir); break; + case ir_quadop_bitfield_insert: + if (lowering(BITFIELD_INSERT_TO_BFM_BFI)) + bitfield_insert_to_bfm_bfi(ir); + break; + default: return visit_continue; } |