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rtlanal.c (rtx_unstable_p, [...]): Don't consider pic register stable if PIC_OFFSET_TABLE_REG_CALL_CLOBBERED.

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* rtlanal.c (rtx_unstable_p, rtx_varies_p): Don't consider pic
        register stable if PIC_OFFSET_TABLE_REG_CALL_CLOBBERED.

From-SVN: r37040
This commit is contained in:
Richard Henderson 2000-10-24 16:01:11 -07:00 committed by Richard Henderson
parent d7836e38b7
commit c0fc376bcf
2 changed files with 27 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2000-10-24 Richard Henderson <rth@cygnus.com>
* rtlanal.c (rtx_unstable_p, rtx_varies_p): Don't consider pic
register stable if PIC_OFFSET_TABLE_REG_CALL_CLOBBERED.
2000-10-24 Aldy Hernandez <aldyh@redhat.com>
* gcse.c (cprop_insn): do not propagate constants into jump_insn

27
gcc/rtlanal.c
View File

@ -70,9 +70,17 @@ rtx_unstable_p (x)
case REG:
/* As in rtx_varies_p, we have to use the actual rtx, not reg number. */
return ! (x == frame_pointer_rtx || x == hard_frame_pointer_rtx
|| x == arg_pointer_rtx || x == pic_offset_table_rtx
|| RTX_UNCHANGING_P (x));
if (x == frame_pointer_rtx || x == hard_frame_pointer_rtx
|| x == arg_pointer_rtx || RTX_UNCHANGING_P (x))
return 0;
#ifndef PIC_OFFSET_TABLE_REG_CALL_CLOBBERED
/* ??? When call-clobbered, the value is stable modulo the restore
that must happen after a call. This currently screws up local-alloc
into believing that the restore is not needed. */
if (x == pic_offset_table_rtx)
return 0;
#endif
return 1;
case ASM_OPERANDS:
if (MEM_VOLATILE_P (x))
@ -135,8 +143,17 @@ rtx_varies_p (x)
and arg pointers and not just the register number in case we have
eliminated the frame and/or arg pointer and are using it
for pseudos. */
return ! (x == frame_pointer_rtx || x == hard_frame_pointer_rtx
|| x == arg_pointer_rtx || x == pic_offset_table_rtx);
if (x == frame_pointer_rtx || x == hard_frame_pointer_rtx
|| x == arg_pointer_rtx)
return 0;
#ifndef PIC_OFFSET_TABLE_REG_CALL_CLOBBERED
/* ??? When call-clobbered, the value is stable modulo the restore
that must happen after a call. This currently screws up local-alloc
into believing that the restore is not needed. */
if (x == pic_offset_table_rtx)
return 0;
#endif
return 1;
case LO_SUM:
/* The operand 0 of a LO_SUM is considered constant