diff options
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/expr.c | 26 |
2 files changed, 27 insertions, 4 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 8982f68..c6a3984 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Thu Dec 17 13:57:23 1998 Nick Clifton <nickc@cygnus.com> + + * expr.c (emit_move_insn_1): Only emit a clobber if the target + is a pseudo register. + Thu Dec 17 13:50:29 1998 Nick Clifton <nickc@cygnus.com> * gcse.c: Include expr.h in order to get the prototype for @@ -2593,9 +2593,18 @@ emit_move_insn_1 (x, y) } else { - /* Show the output dies here. */ + /* Show the output dies here. This is only necessary for pseudos. */ if (x != y) - emit_insn (gen_rtx_CLOBBER (VOIDmode, x)); + { + rtx reg = x; + + while (GET_CODE (reg) == SUBREG) + reg = SUBREG_REG (reg); + + if (GET_CODE (reg) == REG + && REGNO (reg) >= FIRST_PSEUDO_REGISTER) + emit_insn (gen_rtx_CLOBBER (VOIDmode, x)); + } emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code) (gen_realpart (submode, x), gen_realpart (submode, y))); @@ -2624,9 +2633,18 @@ emit_move_insn_1 (x, y) } #endif - /* Show the output dies here. */ + /* Show the output dies here. This is only necessary for pseudos. */ if (x != y) - emit_insn (gen_rtx_CLOBBER (VOIDmode, x)); + { + rtx reg = x; + + while (GET_CODE (reg) == SUBREG) + reg = SUBREG_REG (reg); + + if (GET_CODE (reg) == REG + && REGNO (reg) >= FIRST_PSEUDO_REGISTER) + emit_insn (gen_rtx_CLOBBER (VOIDmode, x)); + } for (i = 0; i < (GET_MODE_SIZE (mode) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; |