Merge pull request shader-slang#1401 from jsmall-nvidia/feature/prelude-fix

Prelude fix/disable memaccess warning on gcc

Author: csyonghe

prelude/slang-cpp-prelude.h

@@ -3,7 +3,18 @@
 
 #include "../slang.h"
 
-#include <math.h>
+// Because the signiture of isnan, isfinite, and is isinf changed in C++, we use the macro
+// to use the version in the std namespace. 
+// https://stackoverflow.com/questions/39130040/cmath-hides-isnan-in-math-h-in-c14-c11
+ 
+#if SLANG_GCC_FAMILY && __GNUC__ < 6
+#   include <cmath>
+#   define SLANG_PRELUDE_STD std::
+#else
+#   include <math.h>
+#   define SLANG_PRELUDE_STD
+#endif
+
 #include <assert.h>
 #include <stdlib.h>
 

prelude/slang-cpp-scalar-intrinsics.h

@@ -68,9 +68,9 @@ SLANG_FORCE_INLINE float F32_rsqrt(float f) { return 1.0f / F32_sqrt(f); }
 SLANG_FORCE_INLINE float F32_sign(float f) { return ( f == 0.0f) ? f : (( f < 0.0f) ? -1.0f : 1.0f); } 
 SLANG_FORCE_INLINE float F32_frac(float f) { return f - F32_floor(f); }
 
-SLANG_FORCE_INLINE bool F32_isnan(float f) { return isnan(f); }
-SLANG_FORCE_INLINE bool F32_isfinite(float f) { return isfinite(f); }
-SLANG_FORCE_INLINE bool F32_isinf(float f) { return isinf(f); }
+SLANG_FORCE_INLINE bool F32_isnan(float f) { return SLANG_PRELUDE_STD isnan(f); }
+SLANG_FORCE_INLINE bool F32_isfinite(float f) { return SLANG_PRELUDE_STD isfinite(f); }
+SLANG_FORCE_INLINE bool F32_isinf(float f) { return SLANG_PRELUDE_STD isinf(f); }
 
 // Binary
 SLANG_FORCE_INLINE float F32_min(float a, float b) { return ::fminf(a, b); }
@@ -84,7 +84,7 @@ SLANG_FORCE_INLINE float F32_frexp(float x, float& e)
 {
     int ei;
     float m = ::frexpf(x, &ei);
-    e = ei;
+    e = float(ei);
     return m;
 }
 SLANG_FORCE_INLINE float F32_modf(float x, float& ip)
@@ -135,9 +135,9 @@ SLANG_FORCE_INLINE double F64_rsqrt(double f) { return 1.0 / F64_sqrt(f); }
 SLANG_FORCE_INLINE double F64_sign(double f) { return (f == 0.0) ? f : ((f < 0.0) ? -1.0 : 1.0); }
 SLANG_FORCE_INLINE double F64_frac(double f) { return f - F64_floor(f); }
 
-SLANG_FORCE_INLINE bool F64_isnan(double f) { return isnan(f); }
-SLANG_FORCE_INLINE bool F64_isfinite(double f) { return isfinite(f); }
-SLANG_FORCE_INLINE bool F64_isinf(double f) { return isinf(f); }
+SLANG_FORCE_INLINE bool F64_isnan(double f) { return SLANG_PRELUDE_STD isnan(f); }
+SLANG_FORCE_INLINE bool F64_isfinite(double f) { return SLANG_PRELUDE_STD isfinite(f); }
+SLANG_FORCE_INLINE bool F64_isinf(double f) { return SLANG_PRELUDE_STD isinf(f); }
 
 // Binary
 SLANG_FORCE_INLINE double F64_min(double a, double b) { return ::fmin(a, b); }
@@ -151,9 +151,10 @@ SLANG_FORCE_INLINE double F64_frexp(double x, double& e)
 {
     int ei;
     double m = ::frexp(x, &ei);
-    e = ei;
+    e = float(ei);
     return m;
 }
+
 SLANG_FORCE_INLINE double F64_modf(double x, double& ip)
 {
     return ::modf(x, &ip);
@@ -236,14 +237,17 @@ SLANG_FORCE_INLINE uint64_t U64_abs(uint64_t f) { return f; }
 SLANG_FORCE_INLINE uint64_t U64_min(uint64_t a, uint64_t b) { return a < b ? a : b; }
 SLANG_FORCE_INLINE uint64_t U64_max(uint64_t a, uint64_t b) { return a > b ? a : b; }
 
+// TODO(JS): We don't define countbits for 64bit in stdlib currently.
+// It's not clear from documentation if it should return 32 or 64 bits, if it exists. 
+// 32 bits can always hold the result, and will be implicitly promoted. 
 SLANG_FORCE_INLINE uint32_t U64_countbits(uint64_t v)
 {
 #if SLANG_GCC_FAMILY    
-    return __builtin_popcountl(v);
+    return uint32_t(__builtin_popcountl(v));
 #elif SLANG_PROCESSOR_X86_64 && SLANG_VC
-    return __popcnt64(v);
+    return uint32_t(__popcnt64(v));
 #else     
-    uint64_t c = 0;
+    uint32_t c = 0;
     while (v)
     {
         c++;

premake5.lua

@@ -201,7 +201,7 @@ workspace "slang"
         architecture "ARM"
 
     filter { "toolset:clang or gcc*" }
-        buildoptions { "-Wno-unused-parameter", "-Wno-type-limits", "-Wno-sign-compare", "-Wno-unused-variable", "-Wno-reorder", "-Wno-switch", "-Wno-return-type", "-Wno-unused-local-typedefs", "-Wno-parentheses",  "-std=c++11", "-fvisibility=hidden" , "-Wno-ignored-optimization-argument", "-Wno-unknown-warning-option"} 
+        buildoptions { "-Wno-unused-parameter", "-Wno-type-limits", "-Wno-sign-compare", "-Wno-unused-variable", "-Wno-reorder", "-Wno-switch", "-Wno-return-type", "-Wno-unused-local-typedefs", "-Wno-parentheses",  "-std=c++11", "-fvisibility=hidden" , "-Wno-ignored-optimization-argument", "-Wno-unknown-warning-option", "-Wno-class-memaccess"} 
 
     filter { "toolset:gcc*"}
         buildoptions { "-Wno-unused-but-set-variable", "-Wno-implicit-fallthrough"  }