Mercurial > hg > graal-jvmci-8

comparison src/share/vm/opto/divnode.cpp @ 1154:174ade00803b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
6910484: incorrect integer optimization (loosing and op-r in a given example) Summary: Remove AND operation only if mask is equal to shift. Reviewed-by: never
author kvn
date Fri, 08 Jan 2010 09:51:24 -0800
parents cecd04fc6f93
children c18cbe5936b8
comparison
equal deleted inserted replaced
1153:bea7a22a6f79 1154:174ade00803b
112 // I can avoid rounding. 112 // I can avoid rounding.
113 const TypeInt *andconi_t = phase->type( dividend->in(2) )->isa_int(); 113 const TypeInt *andconi_t = phase->type( dividend->in(2) )->isa_int();
114 if( andconi_t && andconi_t->is_con() ) { 114 if( andconi_t && andconi_t->is_con() ) {
115 jint andconi = andconi_t->get_con(); 115 jint andconi = andconi_t->get_con();
116 if( andconi < 0 && is_power_of_2(-andconi) && (-andconi) >= d ) { 116 if( andconi < 0 && is_power_of_2(-andconi) && (-andconi) >= d ) {
117 dividend = dividend->in(1); 117 if( (-andconi) == d ) // Remove AND if it clears bits which will be shifted
118 dividend = dividend->in(1);
118 needs_rounding = false; 119 needs_rounding = false;
119 } 120 }
120 } 121 }
121 } 122 }
122 123
354 // I can avoid rounding. 355 // I can avoid rounding.
355 const TypeLong *andconl_t = phase->type( dividend->in(2) )->isa_long(); 356 const TypeLong *andconl_t = phase->type( dividend->in(2) )->isa_long();
356 if( andconl_t && andconl_t->is_con() ) { 357 if( andconl_t && andconl_t->is_con() ) {
357 jlong andconl = andconl_t->get_con(); 358 jlong andconl = andconl_t->get_con();
358 if( andconl < 0 && is_power_of_2_long(-andconl) && (-andconl) >= d ) { 359 if( andconl < 0 && is_power_of_2_long(-andconl) && (-andconl) >= d ) {
359 dividend = dividend->in(1); 360 if( (-andconl) == d ) // Remove AND if it clears bits which will be shifted
361 dividend = dividend->in(1);
360 needs_rounding = false; 362 needs_rounding = false;
361 } 363 }
362 } 364 }
363 } 365 }
364 366