Generate USING_BINARY{32,64}

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/generate-macros.c b/src/generate-macros.c
new file mode 100644
index 0000000..ef87ad5
--- /dev/null
+++ b/src/generate-macros.c
@@ -0,0 +1,22 @@
+#include <stdint.h>
+#include <stdio.h>
+
+int
+main(void)
+{
+	if (sizeof(float) == 4) {
+		unsigned long int a, b;
+		a = (unsigned long int)*(uint32_t *)&(float){  (float)(1. / 12.) };
+		b = (unsigned long int)*(uint32_t *)&(float){ -(float)(1. / 12.) };
+		printf("#define USING_BINARY32 %i\n",
+		       a == 0x3daaaaabUL && b == 0xbdaaaaabUL);
+	}
+	if (sizeof(double) == 8) {
+		unsigned long long int a, b;
+		a = (unsigned long long int)*(uint64_t *)&(double){  1. / 12. };
+		b = (unsigned long long int)*(uint64_t *)&(double){ -1. / 12. };
+		printf("#define USING_BINARY64 %i\n",
+		       a == 0x3fb5555555555555ULL && b == 0xbfb5555555555555ULL);
+	}
+	return 0;
+}