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(replace_regs, case REG): Return copies of SUBREGs, to 

avoid invalid sharing.

From-SVN: r6253
This commit is contained in:
Jim Wilson 1993-12-21 10:25:26 -08:00
parent 77541d4e83
commit 3eb8f14cbc
1 changed files with 8 additions and 1 deletions
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9
gcc/rtlanal.c
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@ -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: