bc59a630ab
Previously, we have confused callee-saved with caller-saved registers (the actual register sets were swapped). This commit fixes that for both `.x86` and `.x86_64` native backends. This commit also fixes the register allocation logic in `genBinMathOp` for `.x86_64` native backend where in a situation such that we require to spill a register, we would end up spilling the register that is already involved in the instruction as the other operand. In such a case, we make a note of this and spill a subsequent register instead.
A general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
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The ultimate goal of the Zig project is to serve users. As a first-order effect, this means users of the compiler, helping programmers to write better software. Even more important, however, are the end-users.
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