On Thu, 2023-08-31 at 20:48 +0800, Yang Yujie wrote:
> * Support options for LoongArch SIMD extensions:
> new configure options --with-simd={none,lsx,lasx};
> new compiler option -msimd={none,lsx,lasx};
> new driver options -m[no]-l[a]sx.
Hmm... In my build (a cross compiler configured with ../gcc/configure --
target=loongarch64-linux-gnu --with-system-zlib) I have:
$ cat lasx.c
int x __attribute__((vector_size(32)));
int y __attribute__((vector_size(32)));
void test(void) { x += y; }
$ gcc/cc1 lasx.c -msimd=lasx -o- -nostdinc -mexplicit-relocs -O2
... ...
pcalau12i $r12,%pc_hi20(.LANCHOR0)
addi.d $r12,$r12,%pc_lo12(.LANCHOR0)
xvld $xr0,$r12,0
xvld $xr1,$r12,32
xvadd.w $xr0,$xr0,$xr1
xvst $xr0,$r12,0
jr $r1
... ...
This seems perfectly fine. But:
$ gcc/xgcc -B gcc lasx.c -mlasx -o- -nostdinc -mexplicit-relocs -O2 -S
... ...
test:
.LFB0 = .
pcalau12i $r12,%pc_hi20(.LANCHOR0)
addi.d $r12,$r12,%pc_lo12(.LANCHOR0)
addi.d $r3,$r3,-16
.LCFI0 = .
st.d $r23,$r3,8
.LCFI1 = .
ldptr.w $r7,$r12,0
ldptr.w $r23,$r12,32
ldptr.w $r6,$r12,8
... ... (no SIMD instructions)
Is this a bug in the driver or I missed something?
--
Xi Ruoyao <[email protected]>
School of Aerospace Science and Technology, Xidian University
