Hi,
Hal Finkel requested that we define a constraint for representing
individual CR bits. We agreed to reserve "wc" for this purpose to
maintain compatibility with LLVM. This patch documents that use.
A pro-forma regstrap is in progress. Assuming no problems, is this ok
for trunk?
Thanks,
Bill
2014-02-28 Bill Schmidt <wschm...@linux.vnet.ibm.com>
* config/rs6000/constraints.md: Document reserved use of "wc".
Index: gcc/config/rs6000/constraints.md
===================================================================
--- gcc/config/rs6000/constraints.md (revision 208237)
+++ gcc/config/rs6000/constraints.md (working copy)
@@ -56,6 +56,9 @@
(define_register_constraint "wa" "rs6000_constraints[RS6000_CONSTRAINT_wa]"
"Any VSX register if the -mvsx option was used or NO_REGS.")
+;; NOTE: For compatibility, "wc" is reserved to represent individual CR bits.
+;; It is currently used for that purpose in LLVM.
+
(define_register_constraint "wd" "rs6000_constraints[RS6000_CONSTRAINT_wd]"
"VSX vector register to hold vector double data or NO_REGS.")
