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glsl: Use M_LOG2E constant instead of calling log2

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This commit is contained in:
Ian Romanick 2010-11-24 14:03:57 -08:00
parent d2d7a273c5
commit da61afa738
2 changed files with 7 additions and 3 deletions
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6
src/glsl/lower_instructions.cpp
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@ -70,7 +70,7 @@
* opportunity to do things like constant fold the (1.0 / op1) easily.
*/
#include "main/core.h" /* for M_E */
#include "main/core.h" /* for M_LOG2E */
#include "glsl_types.h"
#include "ir.h"
#include "ir_optimization.h"
@ -172,7 +172,7 @@ lower_instructions_visitor::div_to_mul_rcp(ir_expression *ir)
void
lower_instructions_visitor::exp_to_exp2(ir_expression *ir)
{
ir_constant *log2_e = new(ir) ir_constant(log2f(M_E));
ir_constant *log2_e = new(ir) ir_constant(float(M_LOG2E));
ir->operation = ir_unop_exp2;
ir->operands[0] = new(ir) ir_expression(ir_binop_mul, ir->operands[0]->type,
@ -186,7 +186,7 @@ lower_instructions_visitor::log_to_log2(ir_expression *ir)
ir->operation = ir_binop_mul;
ir->operands[0] = new(ir) ir_expression(ir_unop_log2, ir->operands[0]->type,
ir->operands[0], NULL);
ir->operands[1] = new(ir) ir_constant(1.0f / log2f(M_E));
ir->operands[1] = new(ir) ir_constant(float(1.0 / M_LOG2E));
this->progress = true;
}

4
src/mesa/main/compiler.h
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@ -358,6 +358,10 @@ static INLINE GLuint CPU_TO_LE32(GLuint x)
#define M_E (2.7182818284590452354)
#endif
#ifndef M_LOG2E
#define M_LOG2E (1.4426950408889634074)
#endif
#ifndef ONE_DIV_LN2
#define ONE_DIV_LN2 (1.442695040888963456)
#endif