As requested, I am posting this patch to gcc-patches.
Problem description:
The detailed description and examples can be found in pr61662, but in
short: using "#ifdef __x86_64__" to determine the size of a 'long' does
not reliably yield the correct result. This causes _lrotl and _lrotr to
return incorrect results on LLP64 systems (like Windows).
ChangeLog:
2014-07-09 David Wohlferd <d...@limegreensocks.com>
PR target/61662
* config/i386/ia32intrin.h: Use __LP64__ to determine size of long
dw
Index: ia32intrin.h
===================================================================
--- ia32intrin.h (revision 212190)
+++ ia32intrin.h (working copy)
@@ -256,11 +256,7 @@
#define _bswap64(a) __bswapq(a)
#define _popcnt64(a) __popcntq(a)
-#define _lrotl(a,b) __rolq((a), (b))
-#define _lrotr(a,b) __rorq((a), (b))
#else
-#define _lrotl(a,b) __rold((a), (b))
-#define _lrotr(a,b) __rord((a), (b))
/* Read flags register */
extern __inline unsigned int
@@ -280,6 +276,15 @@
#endif
+/* on LP64 systems, longs are 64bits. Use the appropriate rotate function */
+#ifdef __LP64__
+#define _lrotl(a,b) __rolq((a), (b))
+#define _lrotr(a,b) __rorq((a), (b))
+#else
+#define _lrotl(a,b) __rold((a), (b))
+#define _lrotr(a,b) __rord((a), (b))
+#endif
+
#define _bit_scan_forward(a) __bsfd(a)
#define _bit_scan_reverse(a) __bsrd(a)
#define _bswap(a) __bswapd(a)
