[llvm-dev] assembly code for array iteration generated by llvm is much slower than gcc

[Sam Elliott via llvm-dev]

Hi,

Am I right in thinking that this is RISC-V assembly?

Please can you provide a testcase (a C file, or LLVM IR) that we can use to diagnose this issue further? It would also be useful to know what architecture (including extensions) and other compiler flags you are using.

We know that the assembly that LLVM generates for RISC-V is not always the most efficient, and we're working on this issue at the moment. We would welcome more testcases.

Sam

> On 26 Apr 2020, at 4:37 am, Lori Yao Yu via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> <image002.jpg>

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Sam Elliott
Software Team Lead
Senior Software Developer - LLVM and OpenTitan
lowRISC CIC