[Bug target/92658] x86 lacks vector extend / truncate

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92658

--- Comment #6 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 47928
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47928&action=edit
Test cases

sse4, avx2 and avx512bw test cases.

Fails:

FAIL: gcc.target/i386/pr92658-avx2.c scan-assembler-times pmovzxbq 2
FAIL: gcc.target/i386/pr92658-sse4.c scan-assembler-times pmovzxbd 2
FAIL: gcc.target/i386/pr92658-sse4.c scan-assembler-times pmovzxbq 2
FAIL: gcc.target/i386/pr92658-sse4.c scan-assembler-times pmovzxwq 2