Add new function enabled() to each of the SIMD_32 instantiations which

returns true if they might plausibly work. AltiVec and SSE2 versions call
into CPUID, scalar version always works.

3 files changed, 9 insertions, 1 deletions

diff --git a/src/utils/simd_32/simd_altivec.h b/src/utils/simd_32/simd_altivec.h
index e63b9bdcc..c3d1a76dc 100644
--- a/src/utils/simd_32/simd_altivec.h
+++ b/src/utils/simd_32/simd_altivec.h
@@ -9,6 +9,8 @@
 #define BOTAN_SIMD_ALTIVEC_H__
 
 #include <botan/loadstor.h>
+#include <botan/cpuid.h>
+
 #include <altivec.h>
 #undef vector
 
@@ -17,6 +19,7 @@ namespace Botan {
 class SIMD_Altivec
    {
    public:
+      bool enabled() const { return CPUID::has_altivec(); }
 
       SIMD_Altivec(const u32bit B[4])
          {
diff --git a/src/utils/simd_32/simd_scalar.h b/src/utils/simd_32/simd_scalar.h
index 38f69c294..606923289 100644
--- a/src/utils/simd_32/simd_scalar.h
+++ b/src/utils/simd_32/simd_scalar.h
@@ -15,6 +15,8 @@ namespace Botan {
 class SIMD_Scalar
    {
    public:
+      bool enabled() const { return true; }
+
       SIMD_Scalar(const u32bit B[4])
          {
          R0 = B[0];
diff --git a/src/utils/simd_32/simd_sse.h b/src/utils/simd_32/simd_sse.h
index 267852554..fcfe6f203 100644
--- a/src/utils/simd_32/simd_sse.h
+++ b/src/utils/simd_32/simd_sse.h
@@ -8,7 +8,8 @@
 #ifndef BOTAN_SIMD_SSE_H__
 #define BOTAN_SIMD_SSE_H__
 
-#include <botan/types.h>
+#include <botan/cpuid.h>
+
 #include <emmintrin.h>
 
 namespace Botan {
@@ -16,6 +17,8 @@ namespace Botan {
 class SIMD_SSE2
    {
    public:
+      bool enabled() const { return CPUID::has_sse2(); }
+
       SIMD_SSE2(const u32bit B[4])
          {
          reg = _mm_loadu_si128((const __m128i*)B);