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flow.c (propagate_one_insn): Preserve live-at-end registers across tail calls.

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* flow.c (propagate_one_insn): Preserve live-at-end registers
        across tail calls.

From-SVN: r68544
This commit is contained in:
Richard Henderson 2003-06-26 13:29:55 -07:00 committed by Richard Henderson
parent 4dbda6f04a
commit d444b5e897
2 changed files with 15 additions and 3 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2003-06-26 Richard Henderson <rth@redhat.com>
* flow.c (propagate_one_insn): Preserve live-at-end registers
across tail calls.
2003-06-26 J"orn Rennecke <joern.rennecke@superh.com>
* reload.c (can_reload_into): New function.

13
gcc/flow.c
View File

@ -1770,8 +1770,10 @@ propagate_one_insn (pbi, insn)
if (GET_CODE (insn) == CALL_INSN)
{
int i;
regset live_at_end;
bool sibcall_p;
rtx note, cond;
int i;
cond = NULL_RTX;
if (GET_CODE (PATTERN (insn)) == COND_EXEC)
@ -1796,9 +1798,14 @@ propagate_one_insn (pbi, insn)
mark_set_1 (pbi, CLOBBER, XEXP (XEXP (note, 0), 0),
cond, insn, pbi->flags);
/* Calls change all call-used and global registers. */
/* Calls change all call-used and global registers; sibcalls do not
clobber anything that must be preserved at end-of-function. */
sibcall_p = SIBLING_CALL_P (insn);
live_at_end = EXIT_BLOCK_PTR->global_live_at_start;
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (TEST_HARD_REG_BIT (regs_invalidated_by_call, i))
if (TEST_HARD_REG_BIT (regs_invalidated_by_call, i)
&& ! (sibcall_p && REGNO_REG_SET_P (live_at_end, i)))
{
/* We do not want REG_UNUSED notes for these registers. */
mark_set_1 (pbi, CLOBBER, regno_reg_rtx[i], cond, insn,