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rs6000.c (rs6000_ra_ever_killed): Call prologue_epilogue_contains instead of using REG_MAYBE_DEAD notes. 

2002-10-08  Aldy Hernandez  <aldyh@redhat.com>

	* config/rs6000/rs6000.c (rs6000_ra_ever_killed): Call
	prologue_epilogue_contains instead of using REG_MAYBE_DEAD notes.

From-SVN: r57985
This commit is contained in:
Aldy Hernandez 2002-10-09 15:54:55 +00:00 committed by Aldy Hernandez
parent e3c6252002
commit 36f7e96410
2 changed files with 16 additions and 10 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2002-10-08 Aldy Hernandez <aldyh@redhat.com>
* config/rs6000/rs6000.c (rs6000_ra_ever_killed): Call
prologue_epilogue_contains instead of using REG_MAYBE_DEAD notes.
Wed Oct 9 15:54:49 2002 J"orn Rennecke <joern.rennecke@superh.com>
* sh.md (ffssi2): Fix emitted code.

21
gcc/config/rs6000/rs6000.c
View File

@ -9446,7 +9446,6 @@ function_ok_for_sibcall (fndecl)
return 0;
}
/* function rewritten to handle sibcalls */
static int
rs6000_ra_ever_killed ()
{
@ -9458,19 +9457,21 @@ rs6000_ra_ever_killed ()
if (current_function_is_thunk)
return 0;
#endif
/* regs_ever_live has LR marked as used if any sibcalls
are present. Which it is, but this should not force
saving and restoring in the prologue/epilog. Likewise,
reg_set_between_p thinks a sibcall clobbers LR, so
that is inappropriate. */
/* regs_ever_live has LR marked as used if any sibcalls are present,
but this should not force saving and restoring in the
pro/epilogue. Likewise, reg_set_between_p thinks a sibcall
clobbers LR, so that is inappropriate. */
/* Also, the prologue can generate a store into LR that
doesn't really count, like this:
move LR->R0
bcl to set PIC register
move LR->R31
move R0->LR
When we're called from the epilog, we need to avoid counting
this as a store; thus we ignore any insns with a REG_MAYBE_DEAD note. */
When we're called from the epilogue, we need to avoid counting
this as a store. */
push_topmost_sequence ();
top = get_insns ();
@ -9486,8 +9487,8 @@ rs6000_ra_ever_killed ()
else if (GET_CODE (insn) == CALL_INSN
&& !SIBLING_CALL_P (insn))
return 1;
else if (set_of (reg, insn) != NULL_RTX
&& find_reg_note (insn, REG_MAYBE_DEAD, NULL_RTX) == 0)
else if (set_of (reg, insn) != NULL_RTX
&& !prologue_epilogue_contains (insn))
return 1;
}
}