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(attach_deaths): When adding REG_DEAD notes... 

(attach_deaths): When adding REG_DEAD notes, check for
the case where a multiple register hard reg overlaps a register
set by the insn.

From-SVN: r7919
This commit is contained in:
Jim Wilson 1994-08-14 15:59:58 -07:00
parent 8700c49499
commit 96cbe26ae9
1 changed files with 10 additions and 0 deletions
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10
gcc/sched.c
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@ -2825,6 +2825,16 @@ attach_deaths (x, insn, set_p)
{
if (! all_needed && ! dead_or_set_p (insn, x))
{
/* Check for the case where the register dying partially
overlaps the register set by this insn. */
if (regno < FIRST_PSEUDO_REGISTER
&& HARD_REGNO_NREGS (regno, GET_MODE (x)) > 1)
{
int n = HARD_REGNO_NREGS (regno, GET_CODE (x));
while (--n >= 0)
some_needed |= dead_or_set_regno_p (insn, regno + n);
}
/* If none of the words in X is needed, make a REG_DEAD
note. Otherwise, we must make partial REG_DEAD
notes. */