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Merge "Disable sanitization for LinearTransform"

This commit is contained in:
Andy Hung 2015-10-22 19:43:23 +00:00 committed by Gerrit Code Review
parent 4a8d1255de 13c19e7703
commit c52b3c08fa
1 changed files with 19 additions and 2 deletions
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21
libutils/LinearTransform.cpp
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@ -21,11 +21,24 @@
#include <utils/LinearTransform.h>
// disable sanitize as these functions may intentionally overflow (see comments below).
// the ifdef can be removed when host builds use clang.
#if defined(__clang__)
#define ATTRIBUTE_NO_SANITIZE_INTEGER __attribute__((no_sanitize("integer")))
#else
#define ATTRIBUTE_NO_SANITIZE_INTEGER
#endif
namespace android {
template<class T> static inline T ABS(T x) { return (x < 0) ? -x : x; }
// sanitize failure with T = int32_t and x = 0x80000000
template<class T>
ATTRIBUTE_NO_SANITIZE_INTEGER
static inline T ABS(T x) { return (x < 0) ? -x : x; }
// Static math methods involving linear transformations
// remote sanitize failure on overflow case.
ATTRIBUTE_NO_SANITIZE_INTEGER
static bool scale_u64_to_u64(
uint64_t val,
uint32_t N,
@ -109,6 +122,8 @@ static bool scale_u64_to_u64(
return true;
}
// at least one known sanitize failure (see comment below)
ATTRIBUTE_NO_SANITIZE_INTEGER
static bool linear_transform_s64_to_s64(
int64_t val,
int64_t basis1,
@ -172,7 +187,7 @@ static bool linear_transform_s64_to_s64(
// (scaled_signbit XOR res_signbit)
if (is_neg)
scaled = -scaled;
scaled = -scaled; // known sanitize failure
res = scaled + basis2;
if ((scaled ^ basis2 ^ INT64_MIN) & (scaled ^ res) & INT64_MIN)
@ -250,6 +265,8 @@ template <class T> void LinearTransform::reduce(T* N, T* D) {
template void LinearTransform::reduce<uint64_t>(uint64_t* N, uint64_t* D);
template void LinearTransform::reduce<uint32_t>(uint32_t* N, uint32_t* D);
// sanitize failure if *N = 0x80000000
ATTRIBUTE_NO_SANITIZE_INTEGER
void LinearTransform::reduce(int32_t* N, uint32_t* D) {
if (N && D && *D) {
if (*N < 0) {