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| author | Michael Meissner <meissner@gcc.gnu.org> | 1992-12-06 12:54:18 +0000 |
|---|---|---|
| committer | Michael Meissner <meissner@gcc.gnu.org> | 1992-12-06 12:54:18 +0000 |
| commit | 2649b2ee2e6ea57aab3098201a3d607d2314746e (patch) | |
| tree | 8a99515e7e718c314d1a4391c94b2af6a66a1cb1 /gcc | |
| parent | 08455880e70070a2d72640ddaf7f994f00f7aaed (diff) | |
| download | gcc-2649b2ee2e6ea57aab3098201a3d607d2314746e.zip gcc-2649b2ee2e6ea57aab3098201a3d607d2314746e.tar.gz gcc-2649b2ee2e6ea57aab3098201a3d607d2314746e.tar.bz2 | |
Allow CSE to generate better code when refering to offsets > 32k.
From-SVN: r2839
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/mips/mips.h | 64 |
1 files changed, 61 insertions, 3 deletions
diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h index 49c54e2..2653b38 100644 --- a/gcc/config/mips/mips.h +++ b/gcc/config/mips/mips.h @@ -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 |