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| author | kenner <kenner@138bc75d-0d04-0410-961f-82ee72b054a4> | 1995-08-26 10:56:53 +0000 |
|---|---|---|
| committer | kenner <kenner@138bc75d-0d04-0410-961f-82ee72b054a4> | 1995-08-26 10:56:53 +0000 |
| commit | fa9351eebb7ec37a3426954c93e0d40a6dbce2c6 (patch) | |
| tree | 3cce62cd492b1a367d56263c40c5907090c3f449 /gcc/reload1.c | |
| parent | 50fad108e70c4b9a4334bb7891b882a06d55a3f1 (diff) | |
| download | gcc-fa9351eebb7ec37a3426954c93e0d40a6dbce2c6.tar.gz | |
(emit_reload_insns): Do nothing for SUBREG whose operand is unused
subsequently.
In secondary reload case, if paradoxical SUBREG for output, reload thing
inside SUBREG, just like gen_reload.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@10284 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/reload1.c')
| -rw-r--r-- | gcc/reload1.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/reload1.c b/gcc/reload1.c index 03ade38203d..5343e2d07a0 100644 --- a/gcc/reload1.c +++ b/gcc/reload1.c @@ -6259,6 +6259,16 @@ emit_reload_insns (insn) XEXP (note, 0) = reload_reg_rtx[j]; continue; } + /* Likewise for a SUBREG of an operand that dies. */ + else if (GET_CODE (old) == SUBREG + && GET_CODE (SUBREG_REG (old)) == REG + && 0 != (note = find_reg_note (insn, REG_UNUSED, + SUBREG_REG (old)))) + { + XEXP (note, 0) = gen_lowpart_common (GET_MODE (old), + reload_reg_rtx[j]); + continue; + } else if (GET_CODE (old) == SCRATCH) /* If we aren't optimizing, there won't be a REG_UNUSED note, but we don't want to make an output reload. */ @@ -6344,11 +6354,23 @@ emit_reload_insns (insn) { rtx third_reloadreg = reload_reg_rtx[reload_secondary_out_reload[secondary_reload]]; + rtx tem; /* Copy primary reload reg to secondary reload reg. (Note that these have been swapped above, then secondary reload reg to OLD using our insn. */ + /* If REAL_OLD is a paradoxical SUBREG, remove it + and try to put the opposite SUBREG on + RELOADREG. */ + if (GET_CODE (real_old) == SUBREG + && (GET_MODE_SIZE (GET_MODE (real_old)) + > GET_MODE_SIZE (GET_MODE (SUBREG_REG (real_old)))) + && 0 != (tem = gen_lowpart_common + (GET_MODE (SUBREG_REG (real_old)), + reloadreg))) + real_old = SUBREG_REG (real_old), reloadreg = tem; + gen_reload (reloadreg, second_reloadreg, reload_opnum[j], reload_when_needed[j]); emit_insn ((GEN_FCN (tertiary_icode) |