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regrename.c (find_oldest_value_reg): Ignore the value chain if the original register was copied in a mode with a...

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* regrename.c (find_oldest_value_reg): Ignore the value chain if
        the original register was copied in a mode with a fewer number of
        hard registers than the desired mode.
        (copyprop_hardreg_forward_1): Likewise.
        (debug_value_data): Fix loop test.
        * toplev.c (parse_options_and_default_flags): Reenable
        -fcprop-registers at -O1.

From-SVN: r48624
This commit is contained in:
Richard Henderson 2002-01-07 22:13:34 -08:00
parent 70ec0b9b9f
commit 57d1019b98
3 changed files with 37 additions and 3 deletions
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12
gcc/ChangeLog
View file

@ -1,4 +1,14 @@
002-01-07 Aldy Hernandez <aldyh@redhat.com>
2002-01-07 Richard Henderson <rth@redhat.com>
* regrename.c (find_oldest_value_reg): Ignore the value chain if
the original register was copied in a mode with a fewer number of
hard registers than the desired mode.
(copyprop_hardreg_forward_1): Likewise.
(debug_value_data): Fix loop test.
* toplev.c (parse_options_and_default_flags): Reenable
-fcprop-registers at -O1.
2002-01-07 Aldy Hernandez <aldyh@redhat.com>
* config/rs6000/rs6000.c (bdesc_2arg): Add altivec predicates.
(altivec_init_builtins): New node v4si_ftype_v16qi_v16qi.

26
gcc/regrename.c
View file

@ -1282,6 +1282,20 @@ find_oldest_value_reg (class, reg, vd)
enum machine_mode mode = GET_MODE (reg);
unsigned int i;
/* If we are accessing REG in some mode other that what we set it in,
make sure that the replacement is valid. In particular, consider
(set (reg:DI r11) (...))
(set (reg:SI r9) (reg:SI r11))
(set (reg:SI r10) (...))
(set (...) (reg:DI r9))
Replacing r9 with r11 is invalid. */
if (mode != vd->e[regno].mode)
{
if (HARD_REGNO_NREGS (regno, mode)
> HARD_REGNO_NREGS (regno, vd->e[regno].mode))
return NULL_RTX;
}
for (i = vd->e[regno].oldest_regno; i != regno; i = vd->e[i].next_regno)
if (TEST_HARD_REG_BIT (reg_class_contents[class], i)
&& (vd->e[i].mode == mode
@ -1544,6 +1558,15 @@ copyprop_hardreg_forward_1 (bb, vd)
unsigned int i;
rtx new;
/* If we are accessing SRC in some mode other that what we
set it in, make sure that the replacement is valid. */
if (mode != vd->e[regno].mode)
{
if (HARD_REGNO_NREGS (regno, mode)
> HARD_REGNO_NREGS (regno, vd->e[regno].mode))
goto no_move_special_case;
}
/* If the destination is also a register, try to find a source
register in the same class. */
if (REG_P (SET_DEST (set)))
@ -1578,6 +1601,7 @@ copyprop_hardreg_forward_1 (bb, vd)
}
}
}
no_move_special_case:
/* For each input operand, replace a hard register with the
eldest live copy that's in an appropriate register class. */
@ -1735,7 +1759,7 @@ debug_value_data (vd)
j != INVALID_REGNUM;
j = vd->e[j].next_regno)
{
if (TEST_HARD_REG_BIT (set, vd->e[j].next_regno))
if (TEST_HARD_REG_BIT (set, j))
{
fprintf (stderr, "[%u] Loop in regno chain\n", j);
return;

2
gcc/toplev.c
View file

@ -4663,7 +4663,7 @@ parse_options_and_default_flags (argc, argv)
flag_omit_frame_pointer = 1;
#endif
flag_guess_branch_prob = 1;
/* flag_cprop_registers = 1; */
flag_cprop_registers = 1;
}
if (optimize >= 2)