http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48252
Summary: problem with consecutive vzip, vuzp and vtrn
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: johan.krist...@axis.com
Consecutive vzip, vuzp or vtrn intrinsic overwrite destination register.
Compiler:
gcc -v
Using built-in specs.
COLLECT_GCC=/usr/local/gcc/4.6/bin/gcc
COLLECT_LTO_WRAPPER=/usr/local/gcc/4.6/libexec/gcc/armv7l-unknown-linux-gnueabi/4.6.0/lto-wrapper
Target: armv7l-unknown-linux-gnueabi
Configured with: ../gcc-4.6/configure --prefix=/usr/local/gcc/4.6
--enable-languages=c --with-arch=armv7-a --with-float=softfp
--with-fpu=vfpv3-d16
Thread model: posix
gcc version 4.6.0 20110323 (prerelease) (GCC)
Test case:
#include
#include
int main(void)
{
uint8x8_t v1 = {1, 1, 1, 1, 1, 1, 1, 1};
uint8x8_t v2 = {2, 2, 2, 2, 2, 2, 2, 2};
uint8x8x2_t vd1, vd2;
union {uint8x8_t v; uint8_t buf[8];} d1, d2, d3, d4;
int i;
vd1 = vzip_u8(v1, vdup_n_u8(0));
vd2 = vzip_u8(v2, vdup_n_u8(0));
vst1_u8(d1.buf, vd1.val[0]);
vst1_u8(d2.buf, vd1.val[1]);
vst1_u8(d3.buf, vd2.val[0]);
vst1_u8(d4.buf, vd2.val[1]);
printf(" d1 d2 d3 d4\n");
for (i = 0; i < 8; i++) {
printf("%4d%4d%4d%4d\n",
d1.buf[i],
d2.buf[i],
d3.buf[i],
d4.buf[i]);
}
return 0;
}
-
Compile flags: -mfloat-abi=softfp -mfpu=neon -O2
Output:
d1 d2 d3 d4
1 1 2 1
0 0 0 0
1 1 2 1
0 0 0 0
1 1 2 1
0 0 0 0
1 1 2 1
0 0 0 0
d4 is wrong.
