[llvm-bugs] [Bug 20035] Recognize horizontal add patterns.

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Jun 21 12:33:10 PDT 2019


Steve Walk <swalk at marvell.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |WORKSFORME
                 CC|                            |swalk at marvell.com

--- Comment #4 from Steve Walk <swalk at marvell.com> ---
This appears to have been fixed since the last time
this issue has been investigated.  Here are the results
with a relatively recent build of clang.

swalk at sbr2s-76:~$ uname -a
Linux sbr2s-76 4.15.0-46-generic #49-Ubuntu SMP Wed Feb 6 09:36:04 UTC 2019
aarch64 aarch64 aarch64 GNU/Linux

clang --version
clang version 9.0.0 (https://github.com/llvm/llvm-project.git
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/swalk/llvm-project/build/bin

swalk at sbr2s-76:~$ cat 20035.c
#include <arm_neon.h>
unsigned hadd(uint32x4_t a) {
  return a[0] + a[1] + a[2] + a[3];
swalk at sbr2s-76:~$ which clang
swalk at sbr2s-76:~$ clang -S -O3 20035.c
swalk at sbr2s-76:~$ cat 20035.s
        .file   "20035.c"
        .globl  hadd                    // -- Begin function hadd
        .p2align        2
        .type   hadd, at function
hadd:                                   // @hadd
// %bb.0:                               // %entry
        addv    s0, v0.4s
        fmov    w0, s0
        .size   hadd, .Lfunc_end0-hadd
                                        // -- End function

        .ident  "clang version 9.0.0 (https://github.com/llvm/llvm-project.git
        .section        ".note.GNU-stack","", at progbits

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