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glsl: lower sqrt(abs()) and inversesqrt(abs()) if requested 

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Samuel Pitoiset 2017-03-17 14:58:22 +01:00
parent 448f4c0c89
commit 737c734cd4
2 changed files with 15 additions and 0 deletions
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1
src/compiler/glsl/ir_optimization.h
View File

@ -53,6 +53,7 @@
#define IMUL_HIGH_TO_MUL 0x80000
#define DDIV_TO_MUL_RCP 0x100000
#define DIV_TO_MUL_RCP (FDIV_TO_MUL_RCP | DDIV_TO_MUL_RCP)
#define SQRT_TO_ABS_SQRT 0x200000
/* Opertaions for lower_64bit_integer_instructions() */
#define MUL64 (1U << 0)

14
src/compiler/glsl/lower_instructions.cpp
View File

@ -168,6 +168,7 @@ private:
void find_lsb_to_float_cast(ir_expression *ir);
void find_msb_to_float_cast(ir_expression *ir);
void imul_high_to_mul(ir_expression *ir);
void sqrt_to_abs_sqrt(ir_expression *ir);
ir_expression *_carry(operand a, operand b);
};
@ -1582,6 +1583,13 @@ lower_instructions_visitor::imul_high_to_mul(ir_expression *ir)
}
}
void
lower_instructions_visitor::sqrt_to_abs_sqrt(ir_expression *ir)
{
ir->operands[0] = new(ir) ir_expression(ir_unop_abs, ir->operands[0]);
this->progress = true;
}
ir_visitor_status
lower_instructions_visitor::visit_leave(ir_expression *ir)
{
@ -1719,6 +1727,12 @@ lower_instructions_visitor::visit_leave(ir_expression *ir)
imul_high_to_mul(ir);
break;
case ir_unop_rsq:
case ir_unop_sqrt:
if (lowering(SQRT_TO_ABS_SQRT))
sqrt_to_abs_sqrt(ir);
break;
default:
return visit_continue;
}