https://llvm.org/bugs/show_bug.cgi?id=26450
Bug ID: 26450
Summary: ARM code runs 2x slower compared to gcc
Product: clang
Version: 3.7
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 15810
--> https://llvm.org/bugs/attachment.cgi?id=15810&action=edit
C source sample
I've recently discovered the sad fact code produced by LLVM on ARM was nowhere
near the speed of gcc:
https://users.rust-lang.org/t/executable-size-and-performance-vs-c/
The same C code (as well as rust code) compiled with -O3 yields identical
performance on x86_64 between gcc/clang/rustc whereas on armv7:
gcc - 1.5s
clang/rustc - 3.4s (3.2s using --ffast-math)
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