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Diffstat (limited to 'gcc/config/rs6000/rs6000.c')
-rw-r--r--gcc/config/rs6000/rs6000.c168
1 files changed, 29 insertions, 139 deletions
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 1ec1dff..21a81f3 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -2391,148 +2391,28 @@ ccr_bit (op, scc_p)
}
}
-/* Return the GOT register, creating it if needed. */
+/* Return the GOT register. */
struct rtx_def *
rs6000_got_register (value)
rtx value;
{
- if (! current_function_uses_pic_offset_table || ! pic_offset_table_rtx)
- {
- if (no_new_pseudos)
- fatal_insn ("internal error -- needed new GOT register during reload phase to load:",
- value);
-
- current_function_uses_pic_offset_table = 1;
- pic_offset_table_rtx = gen_rtx_REG (Pmode, GOT_TOC_REGNUM);
- }
+ /* The second flow pass currently (June 1999) can't update regs_ever_live
+ without disturbing other parts of the compiler, so update it here to
+ make the prolog/epilogue code happy. */
+ if (no_new_pseudos && !regs_ever_live[PIC_OFFSET_TABLE_REGNUM])
+ regs_ever_live[PIC_OFFSET_TABLE_REGNUM] = 1;
+ current_function_uses_pic_offset_table = 1;
return pic_offset_table_rtx;
}
-
-/* Replace all occurrences of register FROM with an new pseudo register in an insn X.
- Store the pseudo register used in REG.
- This is only safe during FINALIZE_PIC, since the registers haven't been setup
- yet. */
-
-static rtx
-rs6000_replace_regno (x, from, reg)
- rtx x;
- int from;
- rtx *reg;
-{
- register int i, j;
- register const char *fmt;
-
- /* Allow this function to make replacements in EXPR_LISTs. */
- if (!x)
- return x;
-
- switch (GET_CODE (x))
- {
- case SCRATCH:
- case PC:
- case CC0:
- case CONST_INT:
- case CONST_DOUBLE:
- case CONST:
- case SYMBOL_REF:
- case LABEL_REF:
- return x;
-
- case REG:
- if (REGNO (x) == from)
- {
- if (! *reg)
- *reg = pic_offset_table_rtx = gen_reg_rtx (Pmode);
-
- return *reg;
- }
-
- return x;
-
- default:
- break;
- }
-
- fmt = GET_RTX_FORMAT (GET_CODE (x));
- for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--)
- {
- if (fmt[i] == 'e')
- XEXP (x, i) = rs6000_replace_regno (XEXP (x, i), from, reg);
- else if (fmt[i] == 'E')
- for (j = XVECLEN (x, i) - 1; j >= 0; j--)
- XVECEXP (x, i, j) = rs6000_replace_regno (XVECEXP (x, i, j), from, reg);
- }
-
- return x;
-}
-
-
-/* By generating position-independent code, when two different
- programs (A and B) share a common library (libC.a), the text of
- the library can be shared whether or not the library is linked at
- the same address for both programs. In some of these
- environments, position-independent code requires not only the use
- of different addressing modes, but also special code to enable the
- use of these addressing modes.
-
- The `FINALIZE_PIC' macro serves as a hook to emit these special
- codes once the function is being compiled into assembly code, but
- not before. (It is not done before, because in the case of
- compiling an inline function, it would lead to multiple PIC
- prologues being included in functions which used inline functions
- and were compiled to assembly language.) */
-
-void
-rs6000_finalize_pic ()
-{
- /* Loop through all of the insns, replacing the special GOT_TOC_REGNUM
- with an appropriate pseudo register. If we find we need GOT/TOC,
- add the appropriate init code. */
- if (flag_pic && (DEFAULT_ABI == ABI_V4 || DEFAULT_ABI == ABI_SOLARIS))
- {
- rtx insn = get_insns ();
- rtx reg = NULL_RTX;
- rtx first_insn;
- rtx last_insn = NULL_RTX;
-
- if (GET_CODE (insn) == NOTE)
- insn = next_nonnote_insn (insn);
-
- first_insn = insn;
- for ( ; insn != NULL_RTX; insn = NEXT_INSN (insn))
- {
- if (GET_RTX_CLASS (GET_CODE (insn)) == 'i')
- {
- PATTERN (insn) = rs6000_replace_regno (PATTERN (insn),
- GOT_TOC_REGNUM,
- &reg);
-
- if (REG_NOTES (insn))
- REG_NOTES (insn) = rs6000_replace_regno (REG_NOTES (insn),
- GOT_TOC_REGNUM,
- &reg);
- }
-
- if (GET_CODE (insn) != NOTE)
- last_insn = insn;
- }
-
- if (reg)
- {
- rtx init = gen_init_v4_pic (reg);
- emit_insn_before (init, first_insn);
- if (!optimize && last_insn)
- emit_insn_after (gen_rtx_USE (VOIDmode, reg), last_insn);
- }
- }
-}
-
-
/* Search for any occurrence of the GOT_TOC register marker that should
- have been eliminated, but may have crept back in. */
+ have been eliminated, but may have crept back in.
+
+ This function could completely go away now (June 1999), but we leave it
+ in for a while until all the possible issues with the new -fpic handling
+ are resolved. */
void
rs6000_reorg (insn)
@@ -2540,7 +2420,7 @@ rs6000_reorg (insn)
{
if (flag_pic && (DEFAULT_ABI == ABI_V4 || DEFAULT_ABI == ABI_SOLARIS))
{
- rtx got_reg = gen_rtx_REG (Pmode, GOT_TOC_REGNUM);
+ rtx got_reg = gen_rtx_REG (Pmode, 2);
for ( ; insn != NULL_RTX; insn = NEXT_INSN (insn))
if (GET_RTX_CLASS (GET_CODE (insn)) == 'i'
&& reg_mentioned_p (got_reg, PATTERN (insn)))
@@ -2556,7 +2436,6 @@ struct machine_function
int save_toc_p;
int fpmem_size;
int fpmem_offset;
- rtx pic_offset_table_rtx;
};
/* Functions to save and restore rs6000_fpmem_size.
@@ -2574,7 +2453,6 @@ rs6000_save_machine_status (p)
machine->sysv_varargs_p = rs6000_sysv_varargs_p;
machine->fpmem_size = rs6000_fpmem_size;
machine->fpmem_offset = rs6000_fpmem_offset;
- machine->pic_offset_table_rtx = pic_offset_table_rtx;
}
void
@@ -2586,7 +2464,6 @@ rs6000_restore_machine_status (p)
rs6000_sysv_varargs_p = machine->sysv_varargs_p;
rs6000_fpmem_size = machine->fpmem_size;
rs6000_fpmem_offset = machine->fpmem_offset;
- pic_offset_table_rtx = machine->pic_offset_table_rtx;
free (machine);
p->machine = (struct machine_function *)0;
@@ -2601,7 +2478,6 @@ rs6000_init_expanders ()
rs6000_sysv_varargs_p = 0;
rs6000_fpmem_size = 0;
rs6000_fpmem_offset = 0;
- pic_offset_table_rtx = (rtx)0;
/* Arrange to save and restore machine status around nested functions. */
save_machine_status = rs6000_save_machine_status;
@@ -2646,7 +2522,7 @@ print_operand (file, x, code)
case '*':
/* Write the register number of the TOC register. */
- fputs (TARGET_MINIMAL_TOC ? reg_names[30] : reg_names[2], file);
+ fputs (TARGET_MINIMAL_TOC ? reg_names[30] : reg_names[2 /* PIC_OFFSET_TABLE_REGNUM? */ ], file);
return;
case '$':
@@ -3252,7 +3128,7 @@ print_operand_address (file, x)
;
#endif
else
- fprintf (file, "(%s)", reg_names[ TARGET_MINIMAL_TOC ? 30 : 2 ]);
+ fprintf (file, "(%s)", reg_names[ TARGET_MINIMAL_TOC ? 30 : 2 /* PIC_OFFSET_TABLE_REGNUM? */ ]);
}
else if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 1)) == REG)
{
@@ -4121,6 +3997,20 @@ output_prolog (file, size)
reg_names[sp_reg]);
}
+ /* If we need PIC_OFFSET_TABLE_REGNUM, initialize it now */
+ if ((DEFAULT_ABI == ABI_V4 || DEFAULT_ABI == ABI_SOLARIS)
+ && flag_pic == 1 && regs_ever_live[PIC_OFFSET_TABLE_REGNUM])
+ {
+ if (!info->lr_save_p)
+ asm_fprintf (file, "\tmflr %s\n", reg_names[0]);
+
+ fputs ("\tbl _GLOBAL_OFFSET_TABLE_@local-4\n", file);
+ asm_fprintf (file, "\tmflr %s\n", reg_names[PIC_OFFSET_TABLE_REGNUM]);
+
+ if (!info->lr_save_p)
+ asm_fprintf (file, "\tmtlr %s\n", reg_names[0]);
+ }
+
/* NT needs us to probe the stack frame every 4k pages for large frames, so
do it here. */
if (DEFAULT_ABI == ABI_NT && info->total_size > 4096)
generated by cgit v1.1 at 2025-03-13 06:44:20 +0000