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mn10300: Add delegitimize_address hook.

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This suppresses warnings generated by the dwarf2 output
routines about uninterpretable addresses.

From-SVN: r168724
This commit is contained in:
Richard Henderson 2011-01-12 09:56:15 -08:00 • committed by Richard Henderson
parent f3d9d2e060
commit 126b148370
2 changed files with 65 additions and 0 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
2011-01-12 Richard Henderson <rth@redhat.com>
* config/mn10300/mn10300.c (mn10300_delegitimize_address): New.
(TARGET_DELEGITIMIZE_ADDRESS): New.
* config/mn10300/mn10300.md (UNSPEC_BSCH): New.
(clzsi2, *bsch): New patterns.

62
gcc/config/mn10300/mn10300.c
View file

@ -2038,6 +2038,66 @@ mn10300_legitimate_constant_p (rtx x)
return true;
}
/* Undo pic address legitimization for the benefit of debug info. */
static rtx
mn10300_delegitimize_address (rtx orig_x)
{
rtx x = orig_x, ret, addend = NULL;
bool need_mem;
if (MEM_P (x))
x = XEXP (x, 0);
if (GET_CODE (x) != PLUS || GET_MODE (x) != Pmode)
return orig_x;
if (XEXP (x, 0) == pic_offset_table_rtx)
;
/* With the REG+REG addressing of AM33, var-tracking can re-assemble
some odd-looking "addresses" that were never valid in the first place.
We need to look harder to avoid warnings being emitted. */
else if (GET_CODE (XEXP (x, 0)) == PLUS)
{
rtx x0 = XEXP (x, 0);
rtx x00 = XEXP (x0, 0);
rtx x01 = XEXP (x0, 1);
if (x00 == pic_offset_table_rtx)
addend = x01;
else if (x01 == pic_offset_table_rtx)
addend = x00;
else
return orig_x;
}
else
return orig_x;
x = XEXP (x, 1);
if (GET_CODE (x) != CONST)
return orig_x;
x = XEXP (x, 0);
if (GET_CODE (x) != UNSPEC)
return orig_x;
ret = XVECEXP (x, 0, 0);
if (XINT (x, 1) == UNSPEC_GOTOFF)
need_mem = false;
else if (XINT (x, 1) == UNSPEC_GOT)
need_mem = true;
else
return orig_x;
gcc_assert (GET_CODE (ret) == SYMBOL_REF);
if (need_mem != MEM_P (orig_x))
return orig_x;
if (need_mem && addend)
return orig_x;
if (addend)
ret = gen_rtx_PLUS (Pmode, addend, ret);
return ret;
}
/* For addresses, costs are relative to "MOV (Rm),Rn". For AM33 this is
the 3-byte fully general instruction; for MN103 this is the 2-byte form
with an address register. */
@ -2722,6 +2782,8 @@ mn10300_conditional_register_usage (void)
#undef TARGET_LEGITIMATE_ADDRESS_P
#define TARGET_LEGITIMATE_ADDRESS_P mn10300_legitimate_address_p
#undef TARGET_DELEGITIMIZE_ADDRESS
#define TARGET_DELEGITIMIZE_ADDRESS mn10300_delegitimize_address
#undef TARGET_PREFERRED_RELOAD_CLASS
#define TARGET_PREFERRED_RELOAD_CLASS mn10300_preferred_reload_class