make xor enable in SSEonly + fast math

recp · Apr 1, 2024 · 1d09c41 · 1d09c41
1 parent d8e933b
commit 1d09c41
Showing 1 changed file with 14 additions and 2 deletions.
diff --git a/include/cglm/simd/x86.h b/include/cglm/simd/x86.h
@@ -55,8 +55,20 @@
 #endif
 
 /* Note that `0x80000000` corresponds to `INT_MIN` for a 32-bit int. */
-#define GLMM_NEGZEROf ((int)0x80000000) /*  0x80000000 ---> -0.0f  */
-#define GLMM_POSZEROf ((int)0x00000000) /*  0x00000000 ---> +0.0f  */
+
+#if defined(__SSE2__)
+#  define GLMM_NEGZEROf ((int)0x80000000) /*  0x80000000 ---> -0.0f  */
+#  define GLMM_POSZEROf ((int)0x00000000) /*  0x00000000 ---> +0.0f  */
+#else
+#  ifdef CGLM_FAST_MATH
+     union { int i; float f; } static GLMM_NEGZEROf_TU = { .i = 0x80000000 };
+#    define GLMM_NEGZEROf GLMM_NEGZEROf_TU.f
+#    define GLMM_POSZEROf 0.0f
+#  else
+#    define GLMM_NEGZEROf -0.0f
+#    define GLMM_POSZEROf  0.0f
+#  endif
+#endif
 
 #if defined(__SSE2__)
 #  define GLMM__SIGNMASKf(X, Y, Z, W)                                         \