| Issue |
203760
|
| Summary |
Changes in ABI make SIMD registers in struct suboptimal
|
| Labels |
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| Assignees |
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| Reporter |
jfalcou
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There's some regression on clang trunk w/r to passing __m256 (and above) values as function parameters.
This is an exampelusing the EVE library:
https://godbolt.org/z/f14n6bf4M
Clang++ 20 is good but trunk without -fclang-abi-compat=20 is not.
This is the effect of https://github.com/llvm/llvm-project/pull/120670/changes
This is very unfortunate as it turns EVERY EXISTING C++ struct wrapping SIMD register types into an unusable mush.
In fact, it also affects std::simd which maybe of some significance
https://godbolt.org/z/9xGhYv18P
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