gcc/
* fold-const.c (optimize_bit_field_compare): Abort early in the strict
volatile bitfields case.
From-SVN: r187869
-2012-05-24 Pat Haugen <pthaugen@us.ibm.com>
+2012-05-25 Thomas Schwinge <thomas@codesourcery.com>
+
+ * fold-const.c (optimize_bit_field_compare): Abort early in the strict
+ volatile bitfields case.
+
+2012-05-24 Pat Haugen <pthaugen@us.ibm.com>
* config/rs6000/rs6000.c (rs6000_option_override_internal): Change
rs6000_sched_costly_dep default to true_store_to_load_dep_costly.
tree mask;
tree offset;
+ /* In the strict volatile bitfields case, doing code changes here may prevent
+ other optimizations, in particular in a SLOW_BYTE_ACCESS setting. */
+ if (flag_strict_volatile_bitfields > 0)
+ return 0;
+
/* Get all the information about the extractions being done. If the bit size
if the same as the size of the underlying object, we aren't doing an
extraction at all and so can do nothing. We also don't want to