| Issue |
144481
|
| Summary |
Don't read from `vpcmpeqd xmm, xmm, xmm` and `vpternlogd zmm, zmm, zmm, 255` simultaneously
|
| Labels |
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| Assignees |
|
| Reporter |
Validark
|
I have some assembly like this: ([Zig Godbolt](https://zig.godbo.lt/#z: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%2B3dXp9foDQdoIaYADdVNDYUwscEsQA6WioADuIKYIOHY%2BC5feldVq09tYZFQbmF9IP9gbwwfHne7cL7g4QZgQ45BJ%2BAZ5njzn9MBBBmfwFCFcVCo9Ag5KxqixnqxmyQg8IKAbseDbBcmzUisGhYgAtJEKwXPB2xYtIKxwZCWI4vBlJUrsvKQtgSaWnqnJkjymZOlUroQOqmrasQBK3q8UG7O87y/P8gLAoxUIwiCPa6taBrkgSRKpqJxpQRW9JVsywmSVyYnLlmRZirKmlSrOtJyQuDIahu4LhBJ%2Bq2tJpoHOapEibaGaOs6tF3sqdL1t665Ntuu4dl2MKWtRLrLBA6wDnELDoAO2ioH4EaoFG0yxkw8aJlZyZkWm2L2WpOYQHmDqpTZkmQjhmUOjGWA0P46BlkeKxDqO55TiCN66XSgEPBooHMQqzkqks1bLm5jabs2O6tnuvk9rV9VjhOTU3j1rV9UyS58iuHruRuW4tm2%2B5%2Bb2zLHqe56XteOlKvemCPsQz4KK%2B76ft%2BKy/is/5bEBIGQmBEEyTB8GIchGGoSs6GYdhuH4YRxEFSmZkUfiVGOUF9FGSQ3WKmxHGvFxQ0eSNXnjaoYZwopcOlX2pMklwJWuPahKw%2BRpVUrJdIPk%2BJHtZBX0MxltP5QFtHLMQrjWMzvXKp8BBhH8XEHLctC0O2LADkTOIDlEyC0FuACO6Da7chX6oDYmZulEDG5Rhr2qZJIW/iLEXW1lK7AOctXArSsq2G6uazresG%2BL9IHALQUhWFEVRTFB0w2byn2eVQLDNV%2BaB3SwdIyKM5YhoZbtZ1X0O5jrHY38uNbaN3l7UJNu85bLI11JCMqicNhsIaLAsOiCKMO4KxftbMm9U1c0NcEy4aMEGhTxoILT7BvWnY1o/j5P0%2Bz1PkRDw1E6L2Pa0T9PXDr1PpAL8dO/HXvpoHxvx%2Bb6xzv07H8O8tSvVszdawEMLouD0tEuqClp/WW8tFbK1Vj7LWAZdbawHN2A2PNG75WftyJudon62Rfg7ZUbFXagM9hAjWUDaAwLgTCA2B1%2ByHD8AQcUGoWDYAYO4CAxxO7ow4s7DgkxaCcEhLwTwHAtCkFQJwAAWmYNY0xZiYC2BcbYPBSAEE0FwyYABrEAOILgDnROiC4GgcTFUhJIORxiACcOEeEcEkPw5RwjOC8AUCAWCSjBFcNIHAWASA0AnDoGEcglBvFRF8eEYw38YyqL4HQIBjiIAslcaQJ0zAvScAUYkionoADywRtAohSbwbxbBBAZIYK2WxWBgiuGAC6BWjjuC8CwCwQwwBxDxPwICEo7Z1y2M%2BMUVwUs8nkEEPUWxtA8DBGIOk5wWBbHf2OAMzpxBgixEwLsTAjSjCjKMMoyYH4mDAAUIiPAmARwZKiIwAZ/BBAiDEOwKQMhBCKBUOoeJuhIgGC2aYcwozgiOMgJMOKjRalwQyQAJXqJgc0mBxSugwj0YAV1nphhBHiOCmzXA1jgiwZAURXB8mMAwBZfDhELOIHgLAvyICTCKCUOwEAHB9FqLBHwwwch5FSLEeIAgGUSFgmkTlDA2isrGBYcFNKmiDG5VwWC1LGjNEqIKjo%2BRugtEldKwYCrRj5CpVIuYEhuG8JsfEkRHAVifJWGEhgqi%2B64EICQWR8jxi8BcVofM6jtiUgHAUSkpjtiSF9ZCSkBjKTIUsdY0gLAQCmNMQOKNsa43xtIAIoRxqHFOMUds/VHALiGuTfY9Nrj8wLLiHYSQQA%3D%3D%3D) [LLVM Godbolt](https://llvm.godbo.lt/#z:OYLghAFBqd5QCxAYwPYBMCmBRdBLAF1QCcAaPECAMzwBtMA7AQwFtMQByARg9KtQYEAysib0QXACx8BBAKoBnTAAUAHpwAMvAFYTStJg1C1aANxakl9ZATwDKjdAGFUtAK4sGexwBk8DTAA5DwAjTGIQACZpAAdUBUI7Bhd3Tz04hNsBPwDgljCI6MtMayyGIQImYgIUjy8uYtKkiqqCHKDQ8KjpBUrq2rSG3tb2vILugEpLVDdiZHYOLBoAgGp0BVQAfVpUUVoVgFIAZicADhXVFbwANklj7BWAARjiTBpVTdUSTYBWLkiIMczhcrrd7odIj8NBMVjs9ps3AxmGx0JsmOh0MRDgB2ABCBw0AEFsIJiABPEAEwkrCF/Q5HAAiK0qdBWe32xEMwEwEBukhWGlIK2uPxhQPOlz54MeJnMADobHEYnLTKc%2BYCThLQXcjg8DpDoVSafqfpF6UyCMREcgVgw3AB3W0KR3ikFS3W0rjM1D04GS073I20o7mlYhQiiXq%2BrV4AMek1moi%2Br2SsG6oMm/nHJmGdDJt1pvWQo5ChQxAwEFa824rbGRI6SDRcOunI6nDTY67XbFHCYZyE/UMKBBuKhUeimTA2Ej51M6os/aSz7XguJ4DYMIVAs2So6RcFAvB7gVCo9mtcbwNE42Q66hln7dm%2Bncrj0yswsOWqU7XOUxZC0Cwbi0AAjugIEak4L7uguPxbic0GFr6fIrAAtA02orBeAj3Ke5wJMAASqJWhrXrScoKMQqBMHKGi0SqU5ypgxGcjYcp4KGzGWkwNglJgbCCM%2BBbzrS1ynjWGj9j82KhuGBCRpWKEmhRVE0XRdGTsgTEsTxBDsd60ZunG2BSec2YrEoxGGf6B6QjJSaunOV7UrSACc95MKyT6Oa%2BDzvvK36/v%2BgHAWBIFyn8AI%2BTBtKCtZvnITW6Hify2GbphyWYWlKVoRhKHZRleU1mluFXPheCEVxAp9mRJpcBoHleWI%2BzRUh/mfoFf4AUBoHgRF/yQTGSEmnFrUiYexWoOuAg5Zl%2BVTRus1FalC0zYVOUFSh6GlbGFkVURlbNjVLl1V65nDqO46YJpRBYmNtk/K58F%2BgldWjZqbp7geJxnieVzHqcp7HpEQNmvVoMrEuv3/BDYn/WD85Sf8oZfHdH1OfGkJcBhJoBmRryVvdmORVSBzYgypNElgAFVJg8Uxe1CoEEqKpqrcg3CfcYr1lwlOEtTBivEJGN%2BbKHU/l1IW9RB26c7qz2IfOeFXCwLBVMA3NfUSVIC7T9NtWLX4S8FPVhf1UXo75z1DUrZUq2rxAaxCWuEhwUy0JwPy8F4HBaKQqCcD4PgAGoALIrAAkgAShZMxzHT%2BpHDwpAEJobtTAA1iAUL6Jwkje2n/ucLwCggIKqe%2B27pBwLASBoCwMR0OE5CUPXjf0BEJg2FaDAZ3wdAEOEpcQCEhfhsw5KcMn49VGSADyITaFOFfJ/XAkEHPDC0BSlekFgIRuMATjNaX3C8FgatGOIu/4K8Nh4JOp9%2B8xU5uIPU%2B8P4g8e7vtB4CEnJyQuCwIXS0eAWAf1IJOYgIR4iYAZPxLkf8jBpymOOJgwAFDBzwJge0c8YiMEgfwQQIgxDsCkDIQQigVDqF3roBoBgUFi30P/UukApioBiGUU%2BqFUIsGQDENw2YABeDBoFe39tA4geAsBsIgFMKwy8kgOAYM4VwdRvCqNGJ0CIDQMiJAEAMeopB9FlG0fkLoQw%2BL3wEC0fo6jBiNCUbYvobR/AdAsboywrijF6GGNUcx4wuAKLjvMCQ7tPYF13gHDgsJaA2ggJaREGcYQQFwIQGcidgm8ArloCYmds6Ch/vnUgPs/YxJLmXFOqCIkcEiFE8pxdqmV3yVAoeyjJBAA%3D%3D%3D))
```asm
.LCPI0_0:
.quad 72340172838076673
prefix_xor_512:
vpopcntq zmm1, zmm0
vpcmpeqd xmm2, xmm2, xmm2
vpmovqb xmm1, zmm1
vpandq xmm1, xmm1, qword ptr [rip + .LCPI0_0]{1to2}
vpclmulqdq xmm1, xmm1, xmm2, 0
vpternlogd zmm2, zmm2, zmm2, 255
vpclmulqdq zmm3, zmm0, zmm2, 0
vpclmulqdq zmm0, zmm0, zmm2, 17
vpmovsxbq zmm1, xmm1
vpunpcklqdq zmm0, zmm3, zmm0
vpxorq zmm0, zmm0, zmm1
ret
```
Should be:
```diff
.LCPI0_0:
.quad 72340172838076673
prefix_xor_512:
vpopcntq zmm1, zmm0
- vpcmpeqd xmm2, xmm2, xmm2
+ vpternlogd zmm2, zmm2, zmm2, 255
vpmovqb xmm1, zmm1
vpandq xmm1, xmm1, qword ptr [rip + .LCPI0_0]{1to2}
vpclmulqdq xmm1, xmm1, xmm2, 0
- vpternlogd zmm2, zmm2, zmm2, 255
vpclmulqdq zmm3, zmm0, zmm2, 0
vpclmulqdq zmm0, zmm0, zmm2, 17
vpmovsxbq zmm1, xmm1
vpunpcklqdq zmm0, zmm3, zmm0
vpxorq zmm0, zmm0, zmm1
ret
```
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