gas/
* config/tc-arm.c (arm_it): Add immisfloat field.
(parse_qfloat_immediate): Disallow integer syntax for floating-point
immediates. Fix hex immediates, handle 0.0 and -0.0 specially.
(parse_neon_mov): Set immisfloat bit for operand if it parsed as a
float.
(neon_cmode_for_move_imm): Reject non-float immediates for float
operands.
(neon_move_immediate): Pass immisfloat bit to
neon_cmode_for_move_imm.
gas/testsuite/
* gas/arm/neon-const.s: Use FP syntax for 0/-0.
* gas/arm/vfp-neon-syntax-inc.s: Likewise, for 1.
* gas/arm/neon-cov.s: Use float syntax for FP immediate.