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Improve alias analysis on ia64 

From-SVN: r38549
This commit is contained in:
Bernd Schmidt 2000-12-29 18:18:50 +00:00 committed by Bernd Schmidt
parent de10dbf5be
commit b5d37c6fc2
4 changed files with 37 additions and 14 deletions
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10
gcc/ChangeLog
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@ -1,5 +1,15 @@
2000-12-29 Bernd Schmidt <bernds@redhat.com>
* ia64.c (ia64_expand_load_address): Accept additional scratch
register argument. All callers & prototype changed.
Use scratch register when generating load_symptr insns.
* ia64.md (movdi_symbolic): Clobber a scratch register. Use it
when calling ia64_expand_load_address.
(movdi): Generate movdi_symbolic with additional operand.
(load_gprel64): Use pic_offset_table_rtx instead of (reg:DI 1).
(load_symptr): Likewise. Use additional operand as a scratch
register instead of generating it here.
* basic-block.h: Add a comment.
* flow.c (PROP_POSTRELOAD): New macro.
(update_life_info): Add it to prop_flags.

2
gcc/config/ia64/ia64-protos.h
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@ -81,7 +81,7 @@ extern void ia64_function_prologue PARAMS((FILE *, int));
extern void ia64_function_epilogue PARAMS((FILE *, int));
extern int ia64_direct_return PARAMS((void));
extern void ia64_expand_load_address PARAMS((rtx, rtx));
extern void ia64_expand_load_address PARAMS((rtx, rtx, rtx));
extern int ia64_hard_regno_rename_ok PARAMS((int, int));
extern void ia64_initialize_trampoline PARAMS((rtx, rtx, rtx));

19
gcc/config/ia64/ia64.c
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@ -798,8 +798,8 @@ ia64_depz_field_mask (rop, rshift)
/* ??? Should generalize this, so that we can also support 32 bit pointers. */
void
ia64_expand_load_address (dest, src)
rtx dest, src;
ia64_expand_load_address (dest, src, scratch)
rtx dest, src, scratch;
{
rtx temp;
@ -831,11 +831,22 @@ ia64_expand_load_address (dest, src)
lo = ((ofs & 0x3fff) ^ 0x2000) - 0x2000;
hi = ofs - lo;
emit_insn (gen_load_symptr (subtarget, plus_constant (sym, hi)));
if (! scratch)
scratch = no_new_pseudos ? subtarget : gen_reg_rtx (DImode);
emit_insn (gen_load_symptr (subtarget, plus_constant (sym, hi),
scratch));
emit_insn (gen_adddi3 (temp, subtarget, GEN_INT (lo)));
}
else
emit_insn (gen_load_symptr (temp, src));
{
rtx insn;
if (! scratch)
scratch = no_new_pseudos ? temp : gen_reg_rtx (DImode);
insn = emit_insn (gen_load_symptr (temp, src, scratch));
REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, src, REG_NOTES (insn));
}
if (temp != dest)
emit_move_insn (dest, temp);

20
gcc/config/ia64/ia64.md
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@ -484,9 +484,9 @@
if (rtx_equal_function_value_matters
&& ! (GET_CODE (operands[1]) == SYMBOL_REF
&& SYMBOL_REF_FLAG (operands[1])))
emit_insn (gen_movdi_symbolic (operands[0], operands[1]));
emit_insn (gen_movdi_symbolic (operands[0], operands[1], gen_reg_rtx (DImode)));
else
ia64_expand_load_address (operands[0], operands[1]);
ia64_expand_load_address (operands[0], operands[1], NULL_RTX);
DONE;
}
}")
@ -551,12 +551,13 @@
(define_insn_and_split "movdi_symbolic"
[(set (match_operand:DI 0 "register_operand" "=r")
(match_operand:DI 1 "symbolic_operand" "s"))
(clobber (match_operand:DI 2 "register_operand" "+r"))
(use (reg:DI 1))]
""
"* abort ();"
""
[(const_int 0)]
"ia64_expand_load_address (operands[0], operands[1]); DONE;")
"ia64_expand_load_address (operands[0], operands[1], operands[2]); DONE;")
(define_insn "*movdi_internal_astep"
[(set (match_operand:DI 0 "destination_operand"
@ -640,7 +641,7 @@
[(const_int 0)]
"
{
ia64_expand_load_address (operands[0], operands[1]);
ia64_expand_load_address (operands[0], operands[1], NULL_RTX);
DONE;
}")
@ -679,24 +680,25 @@
(define_expand "load_gprel64"
[(set (match_dup 2)
(minus:DI (match_operand:DI 1 "symbolic_operand" "") (reg:DI 1)))
(minus:DI (match_operand:DI 1 "symbolic_operand" "") (match_dup 3)))
(set (match_operand:DI 0 "register_operand" "")
(plus:DI (reg:DI 1) (match_dup 2)))]
(plus:DI (match_dup 3) (match_dup 2)))]
""
"
{
operands[2] = no_new_pseudos ? operands[0] : gen_reg_rtx (DImode);
operands[3] = pic_offset_table_rtx;
}")
(define_expand "load_symptr"
[(set (match_dup 2)
(plus:DI (reg:DI 1) (match_operand:DI 1 "got_symbolic_operand" "")))
[(set (match_operand:DI 2 "register_operand" "")
(plus:DI (match_dup 4) (match_operand:DI 1 "got_symbolic_operand" "")))
(set (match_operand:DI 0 "register_operand" "") (match_dup 3))]
""
"
{
operands[2] = no_new_pseudos ? operands[0] : gen_reg_rtx (DImode);
operands[3] = gen_rtx_MEM (DImode, operands[2]);
operands[4] = pic_offset_table_rtx;
RTX_UNCHANGING_P (operands[3]) = 1;
}")