2005-10-16 Erik Edelmann <erik.edelmann@iki.fi>

[pf3gnuchains/gcc-fork.git] / gcc / postreload-gcse.c

diff --git a/gcc/postreload-gcse.c b/gcc/postreload-gcse.c
index a0334ab..ea9c0ef 100644 (file)
--- a/gcc/postreload-gcse.c
+++ b/gcc/postreload-gcse.c
@@ -745,6 +745,12 @@ hash_scan_set (rtx insn)
          can_copy_p (GET_MODE (dest))
          /* Is SET_SRC something we want to gcse?  */
          && general_operand (src, GET_MODE (src))
+#ifdef STACK_REGS
+         /* Never consider insns touching the register stack.  It may
+            create situations that reg-stack cannot handle (e.g. a stack
+            register live across an abnormal edge).  */
+         && (REGNO (dest) < FIRST_STACK_REG || REGNO (dest) > LAST_STACK_REG)
+#endif
          /* An expression is not available if its operands are
             subsequently modified, including this insn.  */
          && oprs_unchanged_p (src, insn, true))
@@ -759,6 +765,10 @@ hash_scan_set (rtx insn)
          can_copy_p (GET_MODE (src))
          /* Is SET_DEST something we want to gcse?  */
          && general_operand (dest, GET_MODE (dest))
+#ifdef STACK_REGS
+         /* As above for STACK_REGS.  */
+         && (REGNO (src) < FIRST_STACK_REG || REGNO (src) > LAST_STACK_REG)
+#endif
          && ! (flag_float_store && FLOAT_MODE_P (GET_MODE (dest)))
          /* Check if the memory expression is killed after insn.  */
          && ! load_killed_in_block_p (INSN_CUID (insn) + 1, dest, true)