Public bug reported:
Compilation with options "-c -mfloat-abi=softfp -mfpu=neon -O2" of the
following code:
#include <arm_neon.h>
void test(int16_t *output)
{
int16x4_t a, b;
int16x4x4_t z;
z.val[0] = vadd_s16(a, b);
z.val[1] = vadd_s16(a, b);
z.val[2] = vsub_s16(a, b);
z.val[3] = vadd_s16(a, b);
vst4_lane_s16(&output[0], z, 0);
vst4_lane_s16(&output[8], z, 1);
}
Causes ICE:
insn-unsat-constr.c: In function ‘test’:
insn-unsat-constr.c:7:21: warning: ‘a’ is used uninitialized in this function
insn-unsat-constr.c:7:21: warning: ‘b’ is used uninitialized in this function
insn-unsat-constr.c:14:1: error: insn does not satisfy its constraints:
(insn 34 13 18 2 /usr/lib/gcc/arm-linux-gnueabi/4.5.2/include/arm_neon.h:10277
(set (reg:OI 95 d16 [orig:147 __b ] [147])
(mem/s/c:OI (pre_dec:SI (reg/f:SI 3 r3 [146])) [3 __b+0 S32 A64])) 739
{*neon_movoi} (expr_list:REG_INC (reg/f:SI 3 r3 [146])
(nil)))
insn-unsat-constr.c:14:1: internal compiler error: in
reload_cse_simplify_operands, at postreload.c:402
The error doesn't occur when optimization is turned off (-O0).
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: gcc-4.5-arm-linux-gnueabi 4.5.2-3ubuntu3cross1.46
ProcVersionSignature:
Uname: Linux 2.6.37-iceberg1 x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Tue Mar 29 12:37:50 2011
InstallationMedia: Mythbuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
SourcePackage: gcc-4.5-armel-cross
** Affects: gcc-4.5-armel-cross (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/744884
Title:
[armel, neon] ICE in reload_cse_simplify_operands, at postreload.c:402
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