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Mirror of https://github.com/RPCS3/llvm-mirror
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On Windows, float arguments are normally passed in float registers in the calling convention for regular functions. For variable argument functions, floats are passed in integer registers. This already was done correctly since many years. However, the surprising bit was that floats among the fixed arguments also are supposed to be passed in integer registers, contrary to regular functions. (This also seems to be the behaviour on ARM though, both on Windows, but also on e.g. hardfloat linux.) In the calling convention, don't promote shorter floats to f64, but convert them to integers of the same length. (Floats passed as part of the actual variable arguments are promoted to double already on the C/Clang level; the LLVM vararg calling convention doesn't do any extra promotion of f32 to f64 - this matches how it works on X86 too.) Technically, this is an ABI break compared to older LLVM versions, but it fixes compatibility with the official platform ABI. (In practice, floats among the fixed arguments in variable argument functions is a pretty rare construct.) Differential Revision: https://reviews.llvm.org/D100365 |
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| RELEASE_TESTERS.TXT | ||
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