sparc.h (MASK_LIVE_G0,TARGET_LIVE_G0): Define.

	* sparc/sparc.h (MASK_LIVE_G0,TARGET_LIVE_G0): Define.
	(TARGET_SWITCHES): Add live-g0.
	(FIRST_PSEUDO_REGISTER): Add 1 for %icc (now 101).
	(FIXED_REGISTERS,CALL_USED_REGISTERS): Update.
	(FIXED_REGISTERS): %g0 is fixed by default.
	(SPARC_{FIRST,LAST}_V9_FCC_REG): Define.
	(SPARC_{ICC,FCC}_REG): Define.
	(CONDITIONAL_REGISTER_USAGE): Don't fix %fcc0 if v8.
	(REG_CLASS_CONTENTS): Reg 0 is an int reg, reg 100 is %icc.
	(REGNO_REG_CLASS): Rewrite to use global `sparc_regno_reg_class'.
	(REG_ALLOC_ORDER,REG_LEAF_ALLOC_ORDER,LEAF_REGISTERS): Add %icc.
	(REG_CLASS_FROM_LETTER): Handle 'c' for FPCC_REGS in non-v9 case.
	(REGNO_OK_FOR_{BASE,INDEX}_P): Treat %g0 as a normal reg.
	(REG_OK_FOR_{BASE,INDEX}_P,EXTRA_CONSTRAINT): Likewise.
	(REGISTER_NAMES): Add %icc.
	(ADDITIONAL_REGISTER_NAMES): Use SPARC_ICC_REG.
	* sparc/sparc.c (leaf_reg_remap): Add %icc=100.
	(reg_or_0_operand): Don't allow 0 if TARGET_LIVE_G0.
	(fcc_reg_operand): Renamed from ccfp_reg_operand.
	Use SPARC_FCC_REG.  Don't treat reg 0 as an fcc reg.  Don't match
	modes if `mode' argument is VOIDmode.
	(icc_or_fcc_reg_operand): New function.
	(gen_compare_reg): Use SPARC_FCC_REG for v8 fp compares.
	Use SPARC_ICC_REG for int compares.
	(eligible_for_epilogue_delay): Don't allow anything if TARGET_LIVE_G0.
	Delete unnecessary test for %g0.
	(emit_move_sequence): Don't emit (set (mem) (const_int 0)) if
	TARGET_LIVE_G0.
	(output_scc_insn): Label moved to operand 3.  Condition code reg
	moved to operand 2.
	(sparc_mode_class): Enum C_MODE renamed to CC_MODE.
	(hard_32bit_mode_classes): Set reg 0 to S_MODES.  Add entry for %icc.
	(hard_64bit_mode_classes): Set reg 0 to D_MODES.  Add entry for %icc.
	(sparc_regno_reg_class): New global.
	(sparc_init_modes): Initialize it.
	(output_cbranch): Delete fp_cond_reg argument.
	(print_operand, MEM op): Don't print "%g0+" if TARGET_SPARCLET.
	(sparc_flat_eligible_for_epilogue_delay): Don't allow anything if
	TARGET_LIVE_G0.
	* sparc/sparc.md (live_g0): New attribute.
	(*): Integer condition code register is now reg 100.
	Use SPARC_ICC_REG instead of hardcoding reg 100 where possible.
	Non-v9 floating point condition code register is now reg 96.
	(*cmp{sf,df,tf}_{fpe,fp}_sp{32,64}): Combine v9/non-v9 cases.
	(*{normal,inverted}_{,fp,fpe}_branch): Update call to output_cbranch.
	(*mov{qi,hi,si}_insn): Don't use if TARGET_LIVE_G0.
	(*mov{qi,hi,si}_insn_liveg0): New patterns.
	(*mov{si,di,sf,df,tf}_ccfp{,e}_sp64): ccfp_reg_operand renamed to
	fcc_reg_operand.
	(*negdi2_sp32,negsi2,one_cmplsi2,ffssi2): Ensure %%g0 is 0 if
	TARGET_LIVE_G0.
	(*one_cmpldi2_sp32): Move operand 1 to rs1 and use 0 as rs2.
	(patterns that use %g0 in rs2): Use 0 immediate value instead.
	(patterns that read %g0): Don't use if TARGET_LIVE_G0.

From-SVN: r11494