https://bugs.llvm.org/show_bug.cgi?id=51147
Bug ID: 51147
Summary: [AArch64] Extremely slow code generation for series of
function calls/addition
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: jstengl...@gmail.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
Created attachment 25038
--> https://bugs.llvm.org/attachment.cgi?id=25038&action=edit
.c file producing failure
In a function containing about 1000 calls and adds, we see the aarch64 target
taking about 30 minutes to do code generation. The slow pass is:
BISECT: running pass (96) AArch64 Instruction Selection on function
(len_internal)
Other targets have no issue and complete quickly.
gcc time: 0.617u 0.022s 0:00.65 96.9% 0+0k 32+160io 0pf+0w
clang aarch64 time: 1998.064u 0.135s 33:23.82 99.7% 0+0k 0+256io 0pf+0w
clang time default target: 0.706u 0.020s 0:00.74 97.2% 0+0k 0+144io 0pf+0w
Command that is slow: clang --target=aarch64-unknown-linux -O3 -c simple.c
Clang version - latest from trunk:
clang version 13.0.0 (https://github.com/llvm/llvm-project
9da70ab3d43c79116f80fc06aa7cf517374ce42c)
Attached the file that causes the slowdown
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
