https://bugs.llvm.org/show_bug.cgi?id=33795
Bug ID: 33795
Summary: [AVX512] incorrect register in vpbroadcastb
instruction
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: babo...@gmail.com
CC: llvm-bugs@lists.llvm.org
Created attachment 18794
--> https://bugs.llvm.org/attachment.cgi?id=18794&action=edit
reproducer
clang trunk, x86 (32 bit mode).
Clang generates "vpbroadcastb %ch, %xmm1" instruction (at least it intends
doing so). The instruction consumes 8 bit from general purpose register, but
only 32 registers are allowed. As a result, clang tries to encode
"vpbroadcastb %ch, %xmm1" as 62 f2 7d 08 7a cd, which really is
"vpbroadcastb %ebp,%zmm1".
I assume instruction description is incorrect.
The instruction was generated by "Machine Instruction Scheduler on function"
pass, if this matters.
Reproducer isn't really small, check "run" file for instruction for compiling
it, they should be self explanatory.
Let me know if more details are needed.
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