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Allow CSE to generate better code when refering to offsets > 32k.

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From-SVN: r2839
This commit is contained in:
Michael Meissner 1992-12-06 12:54:18 +00:00
parent 08455880e7
commit 2649b2ee2e
1 changed files with 61 additions and 3 deletions
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64
gcc/config/mips/mips.h
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@ -482,7 +482,7 @@ while (0)
/* Print subsidiary information on the compiler version in use. */
#define MIPS_VERSION "[AL 1.1, MM 29]"
#define MIPS_VERSION "[AL 1.1, MM 30]"
#ifndef MACHINE_TYPE
#define MACHINE_TYPE "BSD Mips"
@ -2241,9 +2241,67 @@ __enable_execute_stack (addr) \
It is not necessary for this macro to come up with a legitimate
address. The compiler has standard ways of doing so in all
cases. In fact, it is safe for this macro to do nothing. But
often a machine-dependent strategy can generate better code. */
often a machine-dependent strategy can generate better code.
#define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN) {}
For the MIPS, transform:
memory(X + <large int>)
into:
Y = <large int> & ~0x7fff;
Z = X + Y
memory (Z + (<large int> & 0x7fff));
This is for CSE to find several similar references, and only use one Z. */
#define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN) \
{ \
register rtx xinsn = (X); \
\
if (TARGET_DEBUG_B_MODE) \
{ \
GO_PRINTF ("\n========== LEGITIMIZE_ADDRESS\n"); \
GO_DEBUG_RTX (xinsn); \
} \
\
if (GET_CODE (xinsn) == PLUS && optimize) \
{ \
register rtx xplus0 = XEXP (xinsn, 0); \
register rtx xplus1 = XEXP (xinsn, 1); \
register enum rtx_code code0 = GET_CODE (xplus0); \
register enum rtx_code code1 = GET_CODE (xplus1); \
\
if (code0 != REG && code1 == REG) \
{ \
xplus0 = XEXP (xinsn, 1); \
xplus1 = XEXP (xinsn, 0); \
code0 = GET_CODE (xplus0); \
code1 = GET_CODE (xplus1); \
} \
\
if (code0 == REG && REG_OK_FOR_BASE_P (xplus0) \
&& code1 == CONST_INT && !SMALL_INT (xplus1)) \
{ \
rtx int_reg = gen_reg_rtx (Pmode); \
rtx ptr_reg = gen_reg_rtx (Pmode); \
\
emit_move_insn (int_reg, \
GEN_INT (INTVAL (xplus1) & ~ 0x7fff)); \
\
emit_insn (gen_rtx (SET, VOIDmode, \
ptr_reg, \
gen_rtx (PLUS, Pmode, xplus0, int_reg))); \
\
X = gen_rtx (PLUS, Pmode, ptr_reg, \
GEN_INT (INTVAL (xplus1) & 0x7fff)); \
goto WIN; \
} \
} \
\
if (TARGET_DEBUG_B_MODE) \
GO_PRINTF ("LEGITIMIZE_ADDRESS could not fix.\n"); \
}
/* A C statement or compound statement with a conditional `goto