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pa.h (CONSTANT_ADDRESS_P): Do not accept symbolic addresses.

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* pa.h (CONSTANT_ADDRESS_P): Do not accept symbolic
	addresses.
	(LEGITIMIZE_ADDRESS): Just a stub now.  Call
	hppa_legitimize_address to do the real work.

From-SVN: r3570
This commit is contained in:
Jeff Law 1993-03-01 04:15:31 -07:00
parent e26d4611b5
commit 901a8cea7b
1 changed files with 12 additions and 69 deletions
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81
gcc/config/pa/pa.h
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@ -1015,10 +1015,12 @@ extern union tree_node *current_function_decl;
#define MAX_REGS_PER_ADDRESS 2
/* Recognize any constant value that is a valid address. */
#define CONSTANT_ADDRESS_P(X) CONSTANT_P (X)
/* Recognize any constant value that is a valid address except
for symbolic addresses. We get better CSE by rejecting them
here and allowing hppa_legitimize_address to break them up. */
#define CONSTANT_ADDRESS_P(X) \
(CONSTANT_P (X) && ! symbolic_expression_p (X))
/* Include all constant integers and constant doubles, but not
floating-point, except for floating-point zero. */
@ -1191,73 +1193,14 @@ extern union tree_node *current_function_decl;
GO_IF_LEGITIMATE_ADDRESS.
It is always safe for this macro to do nothing. It exists to recognize
opportunities to optimize the output.
opportunities to optimize the output. */
For the PA, transform:
memory(X + <large int>)
into:
Y = <large int> & ~mask;
Z = X + Y
memory (Z + (<large int> & mask));
This is for CSE to find several similar references, and only use one Z.
MODE_FLOAT references allow displacements which fit in 5 bits, so use
0xf as the mask.
MODE_INT references allow displacements which fit in 11 bits, so use
0x1fff as the mask.
This relies on the fact that most mode MODE_FLOAT references will use FP
registers and most mode MODE_INT references will use integer registers.
(In the rare case of an FP register used in an integer MODE, we depend
on secondary reloads and the final output pass to clean things up.)
It is also beneficial to handle (plus (mult (X) (Y)) (Z)) in a special
manner if Y is 2, 4, or 8. (allows more shadd insns and shifted indexed
adressing modes to be used).
Put X and Z into registers. Then put the entire expression into
a register. */
#define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN) \
{ if (GET_CODE (X) == PLUS && GET_CODE (XEXP (X, 0)) == REG \
&& GET_CODE (XEXP (X, 1)) == CONST_INT) \
{ \
rtx int_reg, ptr_reg; \
int offset = INTVAL (XEXP (X, 1)); \
int mask = GET_MODE_CLASS (mode) == MODE_FLOAT ? 0xf \
: 0x1fff; \
int_reg = force_reg (SImode, GEN_INT (offset & ~ mask)); \
ptr_reg = force_reg (SImode, \
gen_rtx (PLUS, SImode, \
XEXP (X, 0), int_reg)); \
X = plus_constant (ptr_reg, offset & mask); \
goto WIN; \
} \
if (GET_CODE (X) == PLUS && GET_CODE (XEXP (X, 0)) == MULT \
&& GET_CODE (XEXP (XEXP (X, 0), 1)) == CONST_INT \
&& shadd_constant_p (INTVAL (XEXP (XEXP (X, 0), 1)))) \
{ \
int val = INTVAL (XEXP (XEXP (X, 0), 1)); \
rtx reg1, reg2; \
reg1 = force_reg (SImode, force_operand (XEXP (X, 1), 0));\
reg2 = force_reg (SImode, \
force_operand (XEXP (XEXP (X, 0), 0), 0));\
(X) = force_reg (SImode, \
gen_rtx (PLUS, SImode, \
gen_rtx (MULT, SImode, reg2, \
GEN_INT (val)), \
reg1)); \
goto WIN; \
} \
if (flag_pic) (X) = legitimize_pic_address (X, MODE, gen_reg_rtx (Pmode));\
if (memory_address_p (MODE, X)) \
goto WIN;}
extern struct rtx_def *hppa_legitimize_address ();
#define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN) \
{ rtx orig_x = (X); \
(X) = hppa_legitimize_address (X, OLDX, MODE); \
if ((X) != orig_x && memory_address_p (MODE, X)) \
goto WIN; }
/* Go to LABEL if ADDR (a legitimate address expression)
has an effect that depends on the machine mode it is used for. */