diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/loop.c | 19 |
2 files changed, 25 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index d045018..85c9451 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2002-10-15 Ulrich Weigand <uweigand@de.ibm.com> + + PR opt/7409 + * loop.c (loop_regs_scan): Mark registers used for function + argument passing as MAY_NOT_OPTIMIZE. + Mon Oct 14 20:33:12 CEST 2002 Jan Hubicka <jh@suse.cz> * i386.md (movv2di_internal): New pattern. @@ -9676,6 +9676,25 @@ loop_regs_scan (loop, extra_size) if (GET_CODE (insn) == CODE_LABEL || GET_CODE (insn) == JUMP_INSN) memset (last_set, 0, regs->num * sizeof (rtx)); + + /* Invalidate all registers used for function argument passing. + We check rtx_varies_p for the same reason as below, to allow + optimizing PIC calculations. */ + if (GET_CODE (insn) == CALL_INSN) + { + rtx link; + for (link = CALL_INSN_FUNCTION_USAGE (insn); + link; + link = XEXP (link, 1)) + { + rtx op, reg; + + if (GET_CODE (op = XEXP (link, 0)) == USE + && GET_CODE (reg = XEXP (op, 0)) == REG + && rtx_varies_p (reg, 1)) + regs->array[REGNO (reg)].may_not_optimize = 1; + } + } } /* Invalidate all hard registers clobbered by calls. With one exception: |