[Bug target/49526] ARM missed optimization: SMMUL instruction
siarhei.siamashka at gmail dot com
gcc-bugzilla@gcc.gnu.org
Fri Jun 24 22:49:00 GMT 2011
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49526
--- Comment #1 from Siarhei Siamashka <siarhei.siamashka at gmail dot com> 2011-06-24 22:48:46 UTC ---
And clang 2.9 has no problems optimizing this code:
$ cat test.c
int smmul(int a, int b) { return ((long long)a * b) >> 32; }
$ clang -ccc-host-triple arm-none-linux -O2 -mcpu=cortex-a8 -S test.c
$ cat test.s
.syntax unified
.cpu cortex-a8
.eabi_attribute 6, 10
.eabi_attribute 7, 65
.eabi_attribute 8, 1
.eabi_attribute 9, 2
.fpu neon
.eabi_attribute 10, 3
.eabi_attribute 12, 1
.eabi_attribute 20, 1
.eabi_attribute 21, 1
.eabi_attribute 23, 3
.eabi_attribute 24, 1
.eabi_attribute 25, 1
.file "test.c"
.text
.globl smmul
.align 2
.type smmul,%function
smmul:
smmul r0, r1, r0
bx lr
.Ltmp0:
.size smmul, .Ltmp0-smmul
More information about the Gcc-bugs
mailing list