[IMPALA-6299] IRBuilder codegen should using LLVMCodeGen::cpu_attrs instead of CpuInfo to determine valid instructions

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Impala 3.1.0
• Component/s: Backend
• Labels: codegen newbie
• Epic Color: ghx-label-1
• Assignee: Pooja Nilangekar
• Reporter: Tim Armstrong
• Created: 09/Dec/17 00:12
• Updated: 25/Jun/19 15:45
• Resolved: 24/Jul/18 00:03

Description

This came out of a discussion on this code review: https://gerrit.cloudera.org/#/c/8802/

The idea is that IRBuilder code that emits intrinsics should only do so if we have those CPU features enabled in LLVM. Otherwise codegen will fail to compile the emitted instructions.