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| author | Richard Kenner <kenner@gcc.gnu.org> | 1994-08-07 08:53:44 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1994-08-07 08:53:44 -0400 |
| commit | 59e2c378c2f9319e9dea14b09a9d3cdd29d2c0cc (patch) | |
| tree | 0f774a1c4502a34caa4243f328eb4d55b62ee186 | |
| parent | 486d850940b886d03a7be2c525a9cc80f90c669c (diff) | |
| download | gcc-59e2c378c2f9319e9dea14b09a9d3cdd29d2c0cc.zip gcc-59e2c378c2f9319e9dea14b09a9d3cdd29d2c0cc.tar.gz gcc-59e2c378c2f9319e9dea14b09a9d3cdd29d2c0cc.tar.bz2 | |
(eliminate_regs, case SUBREG): Add USE of pseudo so we don't
improperly delete an output reload.
From-SVN: r7869
| -rw-r--r-- | gcc/reload1.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/gcc/reload1.c b/gcc/reload1.c index 6e3c7e5..9223c21 100644 --- a/gcc/reload1.c +++ b/gcc/reload1.c @@ -2886,11 +2886,20 @@ eliminate_regs (x, mem_mode, insn) /* If we didn't change anything, we must retain the pseudo. */ if (new == reg_equiv_memory_loc[REGNO (SUBREG_REG (x))]) - new = XEXP (x, 0); + new = SUBREG_REG (x); else - /* Otherwise, ensure NEW isn't shared in case we have to reload - it. */ - new = copy_rtx (new); + { + /* Otherwise, ensure NEW isn't shared in case we have to reload + it. */ + new = copy_rtx (new); + + /* In this case, we must show that the pseudo is used in this + insn so that delete_output_reload will do the right thing. */ + if (insn != 0 && GET_CODE (insn) != EXPR_LIST + && GET_CODE (insn) != INSN_LIST) + emit_insn_before (gen_rtx (USE, VOIDmode, SUBREG_REG (x)), + insn); + } } else new = eliminate_regs (SUBREG_REG (x), mem_mode, insn); |