forked from OSchip/llvm-project
14c1e98754
From Arm v8 Architecture Reference Manual F5.1.84 LDREXD The ldrexd instruction in Arm state has the following conditions: t = UInt(Rt); t2 = t + 1; n = UInt(Rn); if Rt<0> == '1' || t2 == 15 || n == 15 then UNPREDICTABLE; In when Rt is odd or if Rt is 14 (making t2 15). In the implementation when the pair is the UNPREDICTABLE R14_R15 we would ideally return SOFT_FAIL. We can't because there is no R14_R15 value for us to return so we fail early returning FAIL. The early return for registers outside the bounds of the table means the check for Rt == 14 (0xE) redundant which causes a static analyzer to flag the condition as never being true. To fix the warning I've removed the check and replaced with a comment explaining the difference with the specification. Fixes pr41660 Differential Revision: https://reviews.llvm.org/D77463 |
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