Fix 64-bit integer testing

[argilo]

Fixes #681.

As suggested by @jdemel, I've switched to wider integer types in the icompare function.

After this change, errors in the upper 32 bits of 64-bit integers can be detected. For instance, I tried intentionally breaking the volk_64u_byteswap kernel like so:

diff --git a/kernels/volk/volk_64u_byteswap.h b/kernels/volk/volk_64u_byteswap.h
index 2fbf3cc..befde6d 100644
--- a/kernels/volk/volk_64u_byteswap.h
+++ b/kernels/volk/volk_64u_byteswap.h
@@ -128,7 +128,7 @@ static inline void volk_64u_byteswap_generic(uint64_t* intsToSwap,
                    ((output2 << 8) & 0x00ff0000) | ((output2 << 24) & 0xff000000));
 
         *inputPtr++ = output2;
-        *inputPtr++ = output1;
+        *inputPtr++ = output1 ^ 1;
     }
 }
 #endif /* LV_HAVE_GENERIC */

This produces:

    Start 131: qa_volk_64u_byteswappuppet_64u
1/1 Test #131: qa_volk_64u_byteswappuppet_64u ...***Failed    0.04 sec
RUN_VOLK_TESTS: volk_64u_byteswappuppet_64u(131071,1)
generic completed in 0.2203 ms
u_sse2 completed in 0.237667 ms
a_sse2 completed in 0.271871 ms
u_ssse3 completed in 0.181198 ms
a_ssse3 completed in 0.181753 ms
u_avx2 completed in 0.190526 ms
a_avx2 completed in 0.200319 ms
offset 0 in1: -3550658270824899496 in2: -3550658275119866792 tolerance was: 0
offset 1 in1: 5423210972539813137 in2: 5423210968244845841 tolerance was: 0
offset 2 in1: -2700414598271073068 in2: -2700414593976105772 tolerance was: 0
offset 3 in1: -5986464964998556999 in2: -5986464960703589703 tolerance was: 0
offset 4 in1: -9045258131378705733 in2: -9045258135673673029 tolerance was: 0
offset 5 in1: -6281652206429556922 in2: -6281652210724524218 tolerance was: 0
offset 6 in1: -8900826562837636964 in2: -8900826558542669668 tolerance was: 0
offset 7 in1: -5897673898479535170 in2: -5897673894184567874 tolerance was: 0
offset 8 in1: 9110348040616628702 in2: 9110348044911595998 tolerance was: 0
offset 9 in1: -51766911722809408 in2: -51766907427842112 tolerance was: 0
volk_64u_byteswappuppet_64u: fail on arch u_sse2
offset 0 in1: -3550658270824899496 in2: -3550658275119866792 tolerance was: 0
offset 1 in1: 5423210972539813137 in2: 5423210968244845841 tolerance was: 0
offset 2 in1: -2700414598271073068 in2: -2700414593976105772 tolerance was: 0
offset 3 in1: -5986464964998556999 in2: -5986464960703589703 tolerance was: 0
offset 4 in1: -9045258131378705733 in2: -9045258135673673029 tolerance was: 0
offset 5 in1: -6281652206429556922 in2: -6281652210724524218 tolerance was: 0
offset 6 in1: -8900826562837636964 in2: -8900826558542669668 tolerance was: 0
offset 7 in1: -5897673898479535170 in2: -5897673894184567874 tolerance was: 0
offset 8 in1: 9110348040616628702 in2: 9110348044911595998 tolerance was: 0
offset 9 in1: -51766911722809408 in2: -51766907427842112 tolerance was: 0
volk_64u_byteswappuppet_64u: fail on arch u_sse2
offset 0 in1: -3550658270824899496 in2: -3550658275119866792 tolerance was: 0
offset 1 in1: 5423210972539813137 in2: 5423210968244845841 tolerance was: 0
offset 2 in1: -2700414598271073068 in2: -2700414593976105772 tolerance was: 0
offset 3 in1: -5986464964998556999 in2: -5986464960703589703 tolerance was: 0
offset 4 in1: -9045258131378705733 in2: -9045258135673673029 tolerance was: 0
offset 5 in1: -6281652206429556922 in2: -6281652210724524218 tolerance was: 0
offset 6 in1: -8900826562837636964 in2: -8900826558542669668 tolerance was: 0
offset 7 in1: -5897673898479535170 in2: -5897673894184567874 tolerance was: 0
offset 8 in1: 9110348040616628702 in2: 9110348044911595998 tolerance was: 0
offset 9 in1: -51766911722809408 in2: -51766907427842112 tolerance was: 0
volk_64u_byteswappuppet_64u: fail on arch a_sse2
offset 0 in1: -3550658270824899496 in2: -3550658275119866792 tolerance was: 0
offset 1 in1: 5423210972539813137 in2: 5423210968244845841 tolerance was: 0
offset 2 in1: -2700414598271073068 in2: -2700414593976105772 tolerance was: 0
offset 3 in1: -5986464964998556999 in2: -5986464960703589703 tolerance was: 0
offset 4 in1: -9045258131378705733 in2: -9045258135673673029 tolerance was: 0
offset 5 in1: -6281652206429556922 in2: -6281652210724524218 tolerance was: 0
offset 6 in1: -8900826562837636964 in2: -8900826558542669668 tolerance was: 0
offset 7 in1: -5897673898479535170 in2: -5897673894184567874 tolerance was: 0
offset 8 in1: 9110348040616628702 in2: 9110348044911595998 tolerance was: 0
offset 9 in1: -51766911722809408 in2: -51766907427842112 tolerance was: 0
volk_64u_byteswappuppet_64u: fail on arch a_sse2
offset 0 in1: -3550658270824899496 in2: -3550658275119866792 tolerance was: 0
offset 1 in1: 5423210972539813137 in2: 5423210968244845841 tolerance was: 0
offset 2 in1: -2700414598271073068 in2: -2700414593976105772 tolerance was: 0
offset 3 in1: -5986464964998556999 in2: -5986464960703589703 tolerance was: 0
offset 4 in1: -9045258131378705733 in2: -9045258135673673029 tolerance was: 0
offset 5 in1: -6281652206429556922 in2: -6281652210724524218 tolerance was: 0
offset 6 in1: -8900826562837636964 in2: -8900826558542669668 tolerance was: 0
offset 7 in1: -5897673898479535170 in2: -5897673894184567874 tolerance was: 0
offset 8 in1: 9110348040616628702 in2: 9110348044911595998 tolerance was: 0
offset 9 in1: -51766911722809408 in2: -51766907427842112 tolerance was: 0
volk_64u_byteswappuppet_64u: fail on arch u_ssse3
offset 0 in1: -3550658270824899496 in2: -3550658275119866792 tolerance was: 0
offset 1 in1: 5423210972539813137 in2: 5423210968244845841 tolerance was: 0
offset 2 in1: -2700414598271073068 in2: -2700414593976105772 tolerance was: 0
offset 3 in1: -5986464964998556999 in2: -5986464960703589703 tolerance was: 0
offset 4 in1: -9045258131378705733 in2: -9045258135673673029 tolerance was: 0
offset 5 in1: -6281652206429556922 in2: -6281652210724524218 tolerance was: 0
offset 6 in1: -8900826562837636964 in2: -8900826558542669668 tolerance was: 0
offset 7 in1: -5897673898479535170 in2: -5897673894184567874 tolerance was: 0
offset 8 in1: 9110348040616628702 in2: 9110348044911595998 tolerance was: 0
offset 9 in1: -51766911722809408 in2: -51766907427842112 tolerance was: 0
volk_64u_byteswappuppet_64u: fail on arch u_ssse3
offset 0 in1: -3550658270824899496 in2: -3550658275119866792 tolerance was: 0
offset 1 in1: 5423210972539813137 in2: 5423210968244845841 tolerance was: 0
offset 2 in1: -2700414598271073068 in2: -2700414593976105772 tolerance was: 0
offset 3 in1: -5986464964998556999 in2: -5986464960703589703 tolerance was: 0
offset 4 in1: -9045258131378705733 in2: -9045258135673673029 tolerance was: 0
offset 5 in1: -6281652206429556922 in2: -6281652210724524218 tolerance was: 0
offset 6 in1: -8900826562837636964 in2: -8900826558542669668 tolerance was: 0
offset 7 in1: -5897673898479535170 in2: -5897673894184567874 tolerance was: 0
offset 8 in1: 9110348040616628702 in2: 9110348044911595998 tolerance was: 0
offset 9 in1: -51766911722809408 in2: -51766907427842112 tolerance was: 0
volk_64u_byteswappuppet_64u: fail on arch a_ssse3
offset 0 in1: -3550658270824899496 in2: -3550658275119866792 tolerance was: 0
offset 1 in1: 5423210972539813137 in2: 5423210968244845841 tolerance was: 0
offset 2 in1: -2700414598271073068 in2: -2700414593976105772 tolerance was: 0
offset 3 in1: -5986464964998556999 in2: -5986464960703589703 tolerance was: 0
offset 4 in1: -9045258131378705733 in2: -9045258135673673029 tolerance was: 0
offset 5 in1: -6281652206429556922 in2: -6281652210724524218 tolerance was: 0
offset 6 in1: -8900826562837636964 in2: -8900826558542669668 tolerance was: 0
offset 7 in1: -5897673898479535170 in2: -5897673894184567874 tolerance was: 0
offset 8 in1: 9110348040616628702 in2: 9110348044911595998 tolerance was: 0
offset 9 in1: -51766911722809408 in2: -51766907427842112 tolerance was: 0
volk_64u_byteswappuppet_64u: fail on arch a_ssse3
offset 0 in1: -3550658270824899496 in2: -3550658275119866792 tolerance was: 0
offset 1 in1: 5423210972539813137 in2: 5423210968244845841 tolerance was: 0
offset 2 in1: -2700414598271073068 in2: -2700414593976105772 tolerance was: 0
offset 3 in1: -5986464964998556999 in2: -5986464960703589703 tolerance was: 0
offset 4 in1: -9045258131378705733 in2: -9045258135673673029 tolerance was: 0
offset 5 in1: -6281652206429556922 in2: -6281652210724524218 tolerance was: 0
offset 6 in1: -8900826562837636964 in2: -8900826558542669668 tolerance was: 0
offset 7 in1: -5897673898479535170 in2: -5897673894184567874 tolerance was: 0
offset 8 in1: 9110348040616628702 in2: 9110348044911595998 tolerance was: 0
offset 9 in1: -51766911722809408 in2: -51766907427842112 tolerance was: 0
volk_64u_byteswappuppet_64u: fail on arch u_avx2
offset 0 in1: -3550658270824899496 in2: -3550658275119866792 tolerance was: 0
offset 1 in1: 5423210972539813137 in2: 5423210968244845841 tolerance was: 0
offset 2 in1: -2700414598271073068 in2: -2700414593976105772 tolerance was: 0
offset 3 in1: -5986464964998556999 in2: -5986464960703589703 tolerance was: 0
offset 4 in1: -9045258131378705733 in2: -9045258135673673029 tolerance was: 0
offset 5 in1: -6281652206429556922 in2: -6281652210724524218 tolerance was: 0
offset 6 in1: -8900826562837636964 in2: -8900826558542669668 tolerance was: 0
offset 7 in1: -5897673898479535170 in2: -5897673894184567874 tolerance was: 0
offset 8 in1: 9110348040616628702 in2: 9110348044911595998 tolerance was: 0
offset 9 in1: -51766911722809408 in2: -51766907427842112 tolerance was: 0
volk_64u_byteswappuppet_64u: fail on arch u_avx2
offset 0 in1: -3550658270824899496 in2: -3550658275119866792 tolerance was: 0
offset 1 in1: 5423210972539813137 in2: 5423210968244845841 tolerance was: 0
offset 2 in1: -2700414598271073068 in2: -2700414593976105772 tolerance was: 0
offset 3 in1: -5986464964998556999 in2: -5986464960703589703 tolerance was: 0
offset 4 in1: -9045258131378705733 in2: -9045258135673673029 tolerance was: 0
offset 5 in1: -6281652206429556922 in2: -6281652210724524218 tolerance was: 0
offset 6 in1: -8900826562837636964 in2: -8900826558542669668 tolerance was: 0
offset 7 in1: -5897673898479535170 in2: -5897673894184567874 tolerance was: 0
offset 8 in1: 9110348040616628702 in2: 9110348044911595998 tolerance was: 0
offset 9 in1: -51766911722809408 in2: -51766907427842112 tolerance was: 0
volk_64u_byteswappuppet_64u: fail on arch a_avx2
offset 0 in1: -3550658270824899496 in2: -3550658275119866792 tolerance was: 0
offset 1 in1: 5423210972539813137 in2: 5423210968244845841 tolerance was: 0
offset 2 in1: -2700414598271073068 in2: -2700414593976105772 tolerance was: 0
offset 3 in1: -5986464964998556999 in2: -5986464960703589703 tolerance was: 0
offset 4 in1: -9045258131378705733 in2: -9045258135673673029 tolerance was: 0
offset 5 in1: -6281652206429556922 in2: -6281652210724524218 tolerance was: 0
offset 6 in1: -8900826562837636964 in2: -8900826558542669668 tolerance was: 0
offset 7 in1: -5897673898479535170 in2: -5897673894184567874 tolerance was: 0
offset 8 in1: 9110348040616628702 in2: 9110348044911595998 tolerance was: 0
offset 9 in1: -51766911722809408 in2: -51766907427842112 tolerance was: 0
volk_64u_byteswappuppet_64u: fail on arch a_avx2
Best aligned arch: generic
Best unaligned arch: generic