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| author | Richard Henderson <rth@redhat.com> | 2003-10-29 16:55:15 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2003-10-29 16:55:15 -0800 |
| commit | a126dc3a79761cf5f38bdb84cae67e6c47420105 (patch) | |
| tree | f5674203f19436b76a704d1cab3d4713389f2f09 /gcc/config/m68k/m68k.c | |
| parent | 03d1cb6dc60e6386d484bc4ba77a837ce0dffef6 (diff) | |
| download | gcc-a126dc3a79761cf5f38bdb84cae67e6c47420105.zip gcc-a126dc3a79761cf5f38bdb84cae67e6c47420105.tar.gz gcc-a126dc3a79761cf5f38bdb84cae67e6c47420105.tar.bz2 | |
m68k.c (notice_update_cc): Clear cc status for shifts and rotates.
* config/m68k/m68k.c (notice_update_cc): Clear cc status for
shifts and rotates.
From-SVN: r73073
Diffstat (limited to 'gcc/config/m68k/m68k.c')
| -rw-r--r-- | gcc/config/m68k/m68k.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/gcc/config/m68k/m68k.c b/gcc/config/m68k/m68k.c index 565e41f..ee41fc6 100644 --- a/gcc/config/m68k/m68k.c +++ b/gcc/config/m68k/m68k.c @@ -2595,12 +2595,17 @@ notice_update_cc (rtx exp, rtx insn) if (cc_status.value2 != 0) switch (GET_CODE (cc_status.value2)) { - case PLUS: case MINUS: case MULT: - case DIV: case UDIV: case MOD: case UMOD: case NEG: -#if 0 /* These instructions always clear the overflow bit */ case ASHIFT: case ASHIFTRT: case LSHIFTRT: case ROTATE: case ROTATERT: -#endif + /* These instructions always clear the overflow bit, and set + the carry to the bit shifted out. */ + /* ??? We don't currently have a way to signal carry not valid, + nor do we check for it in the branch insns. */ + CC_STATUS_INIT; + break; + + case PLUS: case MINUS: case MULT: + case DIV: case UDIV: case MOD: case UMOD: case NEG: if (GET_MODE (cc_status.value2) != VOIDmode) cc_status.flags |= CC_NO_OVERFLOW; break; |