* config/sparc/sparc.c (const64_high_operand): Zero-extend
operands of SPARC_SETHI_P.
(input_operand): Likewise.
(sparc_emit_set_const32): Likewise.
* config/sparc/sparc.h (SPARC_SETHI_P): Disregard TARGET_ARCH64.
(SPARC_SETHI32_P): Zero-extend operand from 32 bits.
(CONST_OK_FOR_LETTER_P): Use SETHI32 for `K'.  Add `N' as SETHI.
* config/sparc/sparc.md (movdi_insn_sp64_novis): Use `N'.
(movdi_insn_sp64_vis): Likewise.
(movdi split, movdf split): Use SETHI32.
* doc/md.texi: Document SPARC constraints L, M and N.

From-SVN: r50018