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| author | Jim Wilson <wilson@gcc.gnu.org> | 1993-12-21 10:25:26 -0800 |
|---|---|---|
| committer | Jim Wilson <wilson@gcc.gnu.org> | 1993-12-21 10:25:26 -0800 |
| commit | 3eb8f14cbc240ac542ac954dccf0fe8569cc1c30 (patch) | |
| tree | 641115a7cc05f88fda611706434f815d07d72ba4 | |
| parent | 77541d4e8357345d6234f3664b8b2dce7a660275 (diff) | |
| download | gcc-3eb8f14cbc240ac542ac954dccf0fe8569cc1c30.zip gcc-3eb8f14cbc240ac542ac954dccf0fe8569cc1c30.tar.gz gcc-3eb8f14cbc240ac542ac954dccf0fe8569cc1c30.tar.bz2 | |
(replace_regs, case REG): Return copies of SUBREGs, to
avoid invalid sharing.
From-SVN: r6253
| -rw-r--r-- | gcc/rtlanal.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c index 48aa6f9..486ef5f 100644 --- a/gcc/rtlanal.c +++ b/gcc/rtlanal.c @@ -1662,7 +1662,14 @@ replace_regs (x, reg_map, nregs, replace_dest) case REG: /* Verify that the register has an entry before trying to access it. */ if (REGNO (x) < nregs && reg_map[REGNO (x)] != 0) - return reg_map[REGNO (x)]; + { + /* SUBREGs can't be shared. Always return a copy to ensure that if + this replacement occurs more than once then each instance will + get distinct rtx. */ + if (GET_CODE (reg_map[REGNO (x)]) == SUBREG) + return copy_rtx (reg_map[REGNO (x)]); + return reg_map[REGNO (x)]; + } return x; case SUBREG: |