ARM Cortex-R:q5: ldrbne and ldrbeq give "Error: bad instruction" despite being valid

When I attempt to use gcc to compile a *.S file containing the instructions ldrbne or ldrbeq it will not compile.

As an example:
tst.S:
.text
.arm

.global _start
_start:
    ldrbne r12, [lr, #-4]
    ldrbeq r12, [lr, #-8]

arm-none-eabi-gcc -march=armv7-r -mfpu=vfpv3-d16 -mfloat-abi=hard -Wall -Werror -Wextra -g