[llvm-bugs] [Bug 28165] New: [mc] F64 insns -- floating inline constants incorrectly encoded as literals

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28165

            Bug ID: 28165
           Summary: [mc] F64 insns -- floating inline constants
                    incorrectly encoded as literals
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AMDGPU
          Assignee: artem.tamazov at amd.com
          Reporter: artem.tamazov at amd.com
                CC: llvm-bugs at lists.llvm.org, nikolay.haustov at amd.com
    Classification: Unclassified

Example of failing instruction:
> v_ceil_f64 v[27:28], 0.5

In the case above, 0.5 is encoded as 32-bit literal (0x3f000000), which is
incorrect and will be interpreted as 3.0517578125E-5 instead of 0.5. Correct
encoding is inline constant 240 (optimal) or 32-bit literal 0x3FE00000 at
least.

I am almost sure that issue appears for other sub-targets as well, e.g. gfx8.
Number of failing lit1 tests (-search=simple) = 29349.

Tested with r272673 (git # da10a460d7c98278561225fda90855b303675f35).

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