Incorrect handling of floating point constant -0.0

int main()
{
    const float a = 0.0f;
    const float b = -0.0f;
    const float c = std::copysign(0.0f, -1.0f);
    std::printf("%08x\n", byte_cast<uint32_t>(a)); // expected: 0x00000000, actual: 0x00000000
    std::printf("%08x\n", byte_cast<uint32_t>(b)); // expected: 0x80000000, actual: 0x00000000
    std::printf("%08x\n", byte_cast<uint32_t>(c)); // expected: 0x80000000, actual: 0x80000000
    assert(std::signbit(a) == false); // ok
    assert(std::signbit(b) == true);  // fails!
    assert(std::signbit(c) == true);  // ok
}

"C:/ti/compilers/ti-cgt-arm_18.12.3.LTS/bin/armcl" -mv7M4 --code_state=16 --float_support=none -me -O3 --opt_for_speed=4 --include_path="C:/Users/a0321429/workspace_v10_1/negative_zero_test_cc1352r1" --include_path="C:/ti/compilers/ti-cgt-arm_18.12.3.LTS/include" -g --diag_warning=225 --diag_wrap=off --display_error_number --abi=eabi --ramfunc=off --src_interlist --preproc_with_compile --preproc_dependency="main.d_raw"  "../main.cpp"

00000000
00000000
80000000
Assertion failed, (std::signbit(b) == true), file ../main.cpp, line 25

;** 18	-----------------------    a = 0.0F;
;** 19	-----------------------    b = -0.0F;
;* 1080	-----------------------    c = copysignf(C$11 = 0.0F, -1.0F);  // [1]
;** 12	-----------------------    memcpy(&result, &a, 4u);  // [3]
;** 21	-----------------------    printf[VA](C$12 = "%08x\n", (unsigned)result);
;** 12	-----------------------    memcpy(&result, &b, 4u);  // [3]
;** 22	-----------------------    printf[VA](C$12, (unsigned)result);
;** 12	-----------------------    memcpy(&result, &c, 4u);  // [3]
;** 23	-----------------------    printf[VA](C$12, (unsigned)result);
;** 24	-----------------------    assert((_ftoi(C$11)&0x80000000u) == 0);
        PUSH      {V1, V2, LR}          ; [DPU_V7M3_PIPE] 
	.dwcfi	cfa_offset, 12
	.dwcfi	save_reg_to_mem, 14, -4
	.dwcfi	save_reg_to_mem, 5, -8
	.dwcfi	save_reg_to_mem, 4, -12
	.dwpsn	file "../main.cpp",line 18,column 19,is_stmt,isa 1
        MOVS      V1, #0                ; [DPU_V7M3_PIPE] |18| 
	.dwpsn	file "C:/ti/compilers/ti-cgt-arm_18.12.3.LTS/include/libcxx/math.h",line 1080,column 3,is_stmt,isa 1
        MOVS      A2, #0                ; [DPU_V7M3_PIPE] |1080| 
        SUB       SP, SP, #28           ; [DPU_V7M3_PIPE] 
	.dwcfi	cfa_offset, 40
	.dwpsn	file "../main.cpp",line 18,column 19,is_stmt,isa 1
        MOVT      V1, #0                ; [DPU_V7M3_PIPE] |18| 
	.dwpsn	file "C:/ti/compilers/ti-cgt-arm_18.12.3.LTS/include/libcxx/math.h",line 1080,column 3,is_stmt,isa 1
        MOVT      A2, #49024            ; [DPU_V7M3_PIPE] |1080| 
	.dwpsn	file "../main.cpp",line 18,column 19,is_stmt,isa 1
        STR       V1, [SP, #0]          ; [DPU_V7M3_PIPE] |18| 
	.dwpsn	file "C:/ti/compilers/ti-cgt-arm_18.12.3.LTS/include/libcxx/math.h",line 1080,column 3,is_stmt,isa 1
        MOV       A1, V1                ; [DPU_V7M3_PIPE] |1080| 
	.dwpsn	file "../main.cpp",line 19,column 19,is_stmt,isa 1
        STR       V1, [SP, #4]          ; [DPU_V7M3_PIPE] |19|