Mesa (master): glsl: lower sqrt(abs()) and inversesqrt(abs()) if requested
Samuel Pitoiset
hakzsam at kemper.freedesktop.org
Wed Mar 22 21:06:40 UTC 2017
Module: Mesa
Branch: master
Commit: 737c734cd4851968542c58892e50c3afa55471ef
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=737c734cd4851968542c58892e50c3afa55471ef
Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date: Fri Mar 17 14:58:22 2017 +0100
glsl: lower sqrt(abs()) and inversesqrt(abs()) if requested
Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
---
src/compiler/glsl/ir_optimization.h | 1 +
src/compiler/glsl/lower_instructions.cpp | 14 ++++++++++++++
2 files changed, 15 insertions(+)
diff --git a/src/compiler/glsl/ir_optimization.h b/src/compiler/glsl/ir_optimization.h
index 485e8e01ee..82cdac9b3c 100644
--- a/src/compiler/glsl/ir_optimization.h
+++ b/src/compiler/glsl/ir_optimization.h
@@ -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)
diff --git a/src/compiler/glsl/lower_instructions.cpp b/src/compiler/glsl/lower_instructions.cpp
index 729cb13f84..697bb84344 100644
--- a/src/compiler/glsl/lower_instructions.cpp
+++ b/src/compiler/glsl/lower_instructions.cpp
@@ -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;
}
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