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[RS6000] Fix rs6000_adjust_atomic_subword in little-endian mode
- From: Anton Blanchard <anton at samba dot org>
- To: gcc-patches at gcc dot gnu dot org
- Cc: Alan Modra <amodra at gmail dot com>, David Edelsohn <dje dot gcc at gmail dot com>
- Date: Tue, 11 Jun 2013 11:42:40 +1000
- Subject: [RS6000] Fix rs6000_adjust_atomic_subword in little-endian mode
Fixes gcc/testsuite/gcc.dg/sync-2.c
* config/rs6000/rs6000.c (rs6000_adjust_atomic_subword): Calculate
correct shift value in little-endian mode.
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -17314,8 +17314,9 @@ rs6000_adjust_atomic_subword (rtx orig_mem, rtx *pshift, rtx *pmask)
shift = gen_reg_rtx (SImode);
addr = gen_lowpart (SImode, addr);
emit_insn (gen_rlwinm (shift, addr, GEN_INT (3), GEN_INT (shift_mask)));
- shift = expand_simple_binop (SImode, XOR, shift, GEN_INT (shift_mask),
- shift, 1, OPTAB_LIB_WIDEN);
+ if (WORDS_BIG_ENDIAN)
+ shift = expand_simple_binop (SImode, XOR, shift, GEN_INT (shift_mask),
+ shift, 1, OPTAB_LIB_WIDEN);
*pshift = shift;
/* Mask for insertion. */