Add libc_math_exhaustive_tests custom target.

Do we need to remove ceil(f|l).(h|cpp) in src/math folder?

Add comments.

Address comments.

Add comments explaining the correction part.

Fix comment typo.

Remove unused local variables.

[trivial] Fix test comment.

Change UInt_t to UIntType.

Update constants for FDimTest.

[libc] Add implementations of fdim[f|l].

[libc] Add implementations of fdim[f|l].

Change to snake_case.

Change to early return pattern.

Remove TODO's.

Fix comments alignment and remove commented tests.

Update to the new floating point testing facility.

Update comments.

Update comments

Correct the eps when the input is a power of 2, and add a check for correct rounding to even when it is a tie.

Merge with reviews.llvm.org/D85486

In D84725#2183801, @sivachandra wrote:

We currently have UnitTest depend on FPUtil. I think that an creates unnecessary dependency for tests which do not need FPUtil for testing. So, a plan could be:

Instead of EXPECT_EQ and friends for floating point numbers, we will decouple UnitTest from FPUtil using matchers implemented in FPUtil. Say, EXPECT_FP_MATCH etc.

WDYT? If you concur, then you need not do the work. I will do it, and you can absorb those changes into this patch.

Fix explicit specialization in class scope.

[libc] Add implementations of fmax, fmaxf, and fmaxl.