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| author | Nick Clifton <nickc@cygnus.com> | 1998-12-17 14:02:32 +0000 |
|---|---|---|
| committer | Nick Clifton <nickc@gcc.gnu.org> | 1998-12-17 14:02:32 +0000 |
| commit | b2e7e6fb8a3ba620d27b747624a9898716edf031 (patch) | |
| tree | 36e4238959211c912f02a5c7f7e063672508ce52 | |
| parent | 3cdbd1f8ac98649ab5eaba2d9d065653e8a4820d (diff) | |
| download | gcc-b2e7e6fb8a3ba620d27b747624a9898716edf031.zip gcc-b2e7e6fb8a3ba620d27b747624a9898716edf031.tar.gz gcc-b2e7e6fb8a3ba620d27b747624a9898716edf031.tar.bz2 | |
Do not generate CLOBBERs for non-pseudo regs.
From-SVN: r24364
| -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; |