The following fixes PR61559 by implementing the bswap cancellation
patters required for gcc.dg/builtin-bswap-8.c in match.pd.
Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.
Richard.
2014-12-13 Richard Biener <rguent...@suse.de>
PR middle-end/61559
* match.pd: Implement bswap patterns for transforms checked by
gcc.dg/builtin-bswap-8.c.
Index: trunk/gcc/match.pd
===================================================================
*** trunk.orig/gcc/match.pd 2014-11-12 13:43:22.923443604 +0100
--- trunk/gcc/match.pd 2014-11-12 13:44:44.768440023 +0100
*************** along with GCC; see the file COPYING3.
*** 624,629 ****
--- 624,643 ----
@1)
+ /* BSWAP simplifications, transforms checked by gcc.dg/builtin-bswap-8.c. */
+ (for bswap (BUILT_IN_BSWAP16 BUILT_IN_BSWAP32 BUILT_IN_BSWAP64)
+ (simplify
+ (bswap (bswap @0))
+ @0)
+ (simplify
+ (bswap (bit_not (bswap @0)))
+ (bit_not @0))
+ (for bitop (bit_xor bit_ior bit_and)
+ (simplify
+ (bswap (bitop:c (bswap @0) @1))
+ (bitop @0 (bswap @1)))))
+
+
/* Simplifications of comparisons. */
/* We can simplify a logical negation of a comparison to the
