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| author | Richard Stallman <rms@gnu.org> | 1993-05-02 14:01:25 +0000 |
|---|---|---|
| committer | Richard Stallman <rms@gnu.org> | 1993-05-02 14:01:25 +0000 |
| commit | a3b75c072c06a26573736ab8a4cfa08e2b1614fd (patch) | |
| tree | f6aed6a61c4f562b72d4dee84f0a7c6786f19fd3 /gcc | |
| parent | 5b23f690b7d035cb5b44d9e51ea45dd48858f796 (diff) | |
| download | gcc-a3b75c072c06a26573736ab8a4cfa08e2b1614fd.zip gcc-a3b75c072c06a26573736ab8a4cfa08e2b1614fd.tar.gz gcc-a3b75c072c06a26573736ab8a4cfa08e2b1614fd.tar.bz2 | |
(eliminate_regs...
(eliminate_regs, case SUBREG): Leave the SUBREG when
the inner object is a pseudo on machines that extend byte
loads (to be consistent with reload.c).
From-SVN: r4304
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/reload1.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/gcc/reload1.c b/gcc/reload1.c index 0fccda4..c963a33 100644 --- a/gcc/reload1.c +++ b/gcc/reload1.c @@ -2787,7 +2787,17 @@ eliminate_regs (x, mem_mode, insn) { if (GET_CODE (new) == MEM && (GET_MODE_SIZE (GET_MODE (x)) - <= GET_MODE_SIZE (GET_MODE (new)))) + <= GET_MODE_SIZE (GET_MODE (new))) +#if defined(BYTES_LOADS_ZERO_EXTEND) || defined(BYTE_LOADS_SIGN_EXTEND) + /* On these machines we will be reloading what is + inside the SUBREG if it originally was a pseudo and + the inner and outer modes are both a word or + smaller. So leave the SUBREG then. */ + && ! (GET_CODE (SUBREG_REG (x)) == REG + && GET_MODE_SIZE (GET_MODE (x)) <= UNITS_PER_WORD + && GET_MODE_SIZE (GET_MODE (new)) <= UNITS_PER_WORD) +#endif + ) { int offset = SUBREG_WORD (x) * UNITS_PER_WORD; enum machine_mode mode = GET_MODE (x); |