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Since 256-bit vector integer comparison is under TARGET_AVX2, and gimple folding for vblendvpd/vblendvps/vpblendvb relies on that. Restrict gimple fold condition to TARGET_AVX2. gcc/ChangeLog: PR target/106704 * config/i386/i386-builtin.def (BDESC): Add CODE_FOR_avx_blendvpd256/CODE_FOR_avx_blendvps256 to corresponding builtins. * config/i386/i386.cc (ix86_gimple_fold_builtin): Don't fold IX86_BUILTIN_PBLENDVB256, IX86_BUILTIN_BLENDVPS256, IX86_BUILTIN_BLENDVPD256 w/o TARGET_AVX2. gcc/testsuite/ChangeLog: * gcc.target/i386/pr106704.c: New test.
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