i386-protos.h (x86_order_regs_for_local_alloc): Declare
* i386-protos.h (x86_order_regs_for_local_alloc): Declare * i386.c (x86_order_regs_for_local_alloc): New global function. * i386.h (REG_ALLOC_ORDER): CLeanup. (ORDER_REGS_FOR_LOCAL_ALLOC): New. From-SVN: r49574
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Jan Hubicka
Jan Hubicka
parent
3f9796f922
commit
162f023b98
4 changed files with 65 additions and 30 deletions
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Thu Feb 7 12:14:17 CET 2002 Jan Hubicka <jh@suse.cz>
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* i386-protos.h (x86_order_regs_for_local_alloc): Declare
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* i386.c (x86_order_regs_for_local_alloc): New global function.
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* i386.h (REG_ALLOC_ORDER): CLeanup.
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(ORDER_REGS_FOR_LOCAL_ALLOC): New.
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2002-02-07 Richard Henderson <rth@redhat.com>
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* alias.c (find_base_value): Recall base values for fixed hard regs.
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@ -169,6 +169,7 @@ extern int ix86_memory_move_cost PARAMS ((enum machine_mode, enum reg_class,
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extern void ix86_set_move_mem_attrs PARAMS ((rtx, rtx, rtx, rtx, rtx));
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extern void emit_i387_cw_initialization PARAMS ((rtx, rtx));
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extern bool ix86_fp_jump_nontrivial_p PARAMS ((enum rtx_code));
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extern void x86_order_regs_for_local_alloc PARAMS ((void));
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#ifdef TREE_CODE
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@ -12312,3 +12312,47 @@ ix86_svr3_asm_out_constructor (symbol, priority)
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fputc ('\n', asm_out_file);
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}
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#endif
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/* Order the registers for register allocator. */
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void
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x86_order_regs_for_local_alloc ()
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{
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int pos = 0;
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int i;
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/* First allocate the local general purpose registers. */
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for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
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if (GENERAL_REGNO_P (i) && call_used_regs[i])
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reg_alloc_order [pos++] = i;
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/* Global general purpose registers. */
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for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
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if (GENERAL_REGNO_P (i) && !call_used_regs[i])
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reg_alloc_order [pos++] = i;
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/* x87 registers come first in case we are doing FP math
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using them. */
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if (!TARGET_SSE_MATH)
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for (i = FIRST_STACK_REG; i <= LAST_STACK_REG; i++)
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reg_alloc_order [pos++] = i;
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/* SSE registers. */
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for (i = FIRST_SSE_REG; i <= LAST_SSE_REG; i++)
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reg_alloc_order [pos++] = i;
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for (i = FIRST_REX_SSE_REG; i <= LAST_REX_SSE_REG; i++)
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reg_alloc_order [pos++] = i;
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/* x87 registerts. */
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if (TARGET_SSE_MATH)
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for (i = FIRST_STACK_REG; i <= LAST_STACK_REG; i++)
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reg_alloc_order [pos++] = i;
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for (i = FIRST_MMX_REG; i <= LAST_MMX_REG; i++)
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reg_alloc_order [pos++] = i;
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/* Initialize the rest of array as we do not allocate some registers
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at all. */
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while (pos < FIRST_PSEUDO_REGISTER)
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reg_alloc_order [pos++] = 0;
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}
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@ -926,38 +926,21 @@ extern int ix86_arch;
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registers listed in CALL_USED_REGISTERS, keeping the others
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available for storage of persistent values.
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Three different versions of REG_ALLOC_ORDER have been tried:
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If the order is edx, ecx, eax, ... it produces a slightly faster compiler,
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but slower code on simple functions returning values in eax.
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If the order is eax, ecx, edx, ... it causes reload to abort when compiling
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perl 4.036 due to not being able to create a DImode register (to hold a 2
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word union).
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If the order is eax, edx, ecx, ... it produces better code for simple
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functions, and a slightly slower compiler. Users complained about the code
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generated by allocating edx first, so restore the 'natural' order of things. */
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The ORDER_REGS_FOR_LOCAL_ALLOC actually overwrite the order,
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so this is just empty initializer for array. */
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#define REG_ALLOC_ORDER \
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/*ax,dx,cx,*/ \
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{ 0, 1, 2, \
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/* bx,si,di,bp,sp,*/ \
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3, 4, 5, 6, 7, \
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/*r8,r9,r10,r11,*/ \
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37,38, 39, 40, \
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/*r12,r15,r14,r13*/ \
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41, 44, 43, 42, \
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/*xmm0,xmm1,xmm2,xmm3,xmm4,xmm5,xmm6,xmm7*/ \
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21, 22, 23, 24, 25, 26, 27, 28, \
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/*xmm8,xmm9,xmm10,xmm11,xmm12,xmm13,xmm14,xmm15*/ \
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45, 46, 47, 48, 49, 50, 51, 52, \
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/*st,st1,st2,st3,st4,st5,st6,st7*/ \
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8, 9, 10, 11, 12, 13, 14, 15, \
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/*,arg,cc,fpsr,dir,frame*/ \
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16,17, 18, 19, 20, \
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/*mmx0,mmx1,mmx2,mmx3,mmx4,mmx5,mmx6,mmx7*/ \
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29, 30, 31, 32, 33, 34, 35, 36 }
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,\
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18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, \
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33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, \
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48, 49, 50, 51, 52 }
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/* ORDER_REGS_FOR_LOCAL_ALLOC is a macro which permits reg_alloc_order
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to be rearranged based on a particular function. When using sse math,
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we want to allocase SSE before x87 registers and vice vera. */
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#define ORDER_REGS_FOR_LOCAL_ALLOC x86_order_regs_for_local_alloc ()
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/* Macro to conditionally modify fixed_regs/call_used_regs. */
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#define CONDITIONAL_REGISTER_USAGE \
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