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m68k.c (notice_update_cc): Clear cc status for shifts and rotates.

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* config/m68k/m68k.c (notice_update_cc): Clear cc status for
        shifts and rotates.

From-SVN: r73073
This commit is contained in:
Richard Henderson 2003-10-29 16:55:15 -08:00 committed by Richard Henderson
parent 03d1cb6dc6
commit a126dc3a79
2 changed files with 14 additions and 4 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2003-10-29 Richard Henderson <rth@redhat.com>
* config/m68k/m68k.c (notice_update_cc): Clear cc status for
shifts and rotates.
2003-10-30 Alan Modra <amodra@bigpond.net.au>
* config/rs6000/rs6000.md: Remove duplicate pattern.

13
gcc/config/m68k/m68k.c
View File

@ -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;