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glsl/loops: Remove unused fields iv_scale and biv from loop_variable class.

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These fields were part of some planned optimizations that never
materialized.  Remove them for now to simplify things; if we ever get
round to adding the optimizations that would require them, we can
always re-introduce them.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Paul Berry 2013-11-28 12:17:54 -08:00
parent e00b93a1f7
commit 115fd75ab0
2 changed files with 4 additions and 12 deletions
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2
src/glsl/loop_analysis.cpp
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@ -389,8 +389,6 @@ loop_analysis::visit_leave(ir_loop *ir)
ir_rvalue *const inc = ir_rvalue *const inc =
get_basic_induction_increment(lv->first_assignment, ls->var_hash); get_basic_induction_increment(lv->first_assignment, ls->var_hash);
if (inc != NULL) { if (inc != NULL) {
lv->iv_scale = NULL;
lv->biv = lv->var;
lv->increment = inc; lv->increment = inc;
lv->remove(); lv->remove();

14
src/glsl/loop_analysis.h
View file

@ -179,20 +179,14 @@ public:
unsigned num_assignments; unsigned num_assignments;
/** /**
* Increment values for loop induction variables * Increment value for a loop induction variable
* *
* Loop induction variables have a single increment of the form * If this is a loop induction variable, the amount by which the variable
* \c b * \c biv + \c c, where \c b and \c c are loop constants and \c i * is incremented on each iteration through the loop.
* is a basic loop induction variable.
* *
* If \c iv_scale is \c NULL, 1 is used. If \c biv is the same as \c var, * If this is not a loop induction variable, NULL.
* then \c var is a basic loop induction variable.
*/ */
/*@{*/
ir_rvalue *iv_scale;
ir_variable *biv;
ir_rvalue *increment; ir_rvalue *increment;
/*@}*/
inline bool is_loop_constant() const inline bool is_loop_constant() const