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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-20 20:19:15 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-20 20:19:15 -0700
commitcfa76f024f7c9e65169425804e5b32e71f66d0ee (patch)
treeee64e98cbfb1b654842c9256446a9584857f6730 /arch/parisc/lib/libgcc/__umulsidi3.c
parent093faa1dd26fc6766f8f04c429030757a8a0def4 (diff)
parent7210c678202bb3107085bffeb63f66a9b8ba1c85 (diff)
Merge branch 'master' of hera.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6
* 'master' of hera.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6: (29 commits) [PARISC] fix uninitialized variable warning in asm/rtc.h [PARISC] Port checkstack.pl to parisc [PARISC] Make palo target work when $obj != $src [PARISC] Zap unused variable warnings in pci.c [PARISC] Fix tests in palo target [PARISC] Fix palo target [PARISC] Restore palo target [PARISC] Attempt to clean up parisc/Makefile [PARISC] Fix infinite loop in /proc/iomem [PARISC] Quiet sysfs_create_link __must_check warnings in pdc_stable [PARISC] Squelch pci_enable_device __must_check warning in superio [PARISC] Kill off broken irqstack code [PARISC] Remove hardcoded uses of PAGE_SIZE [PARISC] Clean up pointless ASM_PAGE_SIZE_DIV use [PARISC] Kill off the last vestiges of ASM_PAGE_SIZE [PARISC] Kill off ASM_PAGE_SIZE use [PARISC] Beautify parisc vmlinux.lds.S [PARISC] Clean up a resource_size_t warning in sba_iommu [PARISC] Kill incorrect cast warning in unwinder [PARISC] Kill zone_to_nid printk warning ... Fixed trivial conflict in include/asm-parisc/tlbflush.h manually
Diffstat (limited to 'arch/parisc/lib/libgcc/__umulsidi3.c')
-rw-r--r--arch/parisc/lib/libgcc/__umulsidi3.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/parisc/lib/libgcc/__umulsidi3.c b/arch/parisc/lib/libgcc/__umulsidi3.c
new file mode 100644
index 00000000000..396f669164d
--- /dev/null
+++ b/arch/parisc/lib/libgcc/__umulsidi3.c
@@ -0,0 +1,46 @@
+#include "libgcc.h"
+
+#define __ll_B ((u32) 1 << (32 / 2))
+#define __ll_lowpart(t) ((u32) (t) & (__ll_B - 1))
+#define __ll_highpart(t) ((u32) (t) >> 16)
+
+#define umul_ppmm(w1, w0, u, v) \
+ do { \
+ u32 __x0, __x1, __x2, __x3; \
+ u16 __ul, __vl, __uh, __vh; \
+ \
+ __ul = __ll_lowpart (u); \
+ __uh = __ll_highpart (u); \
+ __vl = __ll_lowpart (v); \
+ __vh = __ll_highpart (v); \
+ \
+ __x0 = (u32) __ul * __vl; \
+ __x1 = (u32) __ul * __vh; \
+ __x2 = (u32) __uh * __vl; \
+ __x3 = (u32) __uh * __vh; \
+ \
+ __x1 += __ll_highpart (__x0);/* this can't give carry */ \
+ __x1 += __x2; /* but this indeed can */ \
+ if (__x1 < __x2) /* did we get it? */ \
+ __x3 += __ll_B; /* yes, add it in the proper pos. */ \
+ \
+ (w1) = __x3 + __ll_highpart (__x1); \
+ (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \
+ } while (0)
+
+union DWunion {
+ struct {
+ s32 high;
+ s32 low;
+ } s;
+ s64 ll;
+};
+
+u64 __umulsidi3(u32 u, u32 v)
+{
+ union DWunion __w;
+
+ umul_ppmm(__w.s.high, __w.s.low, u, v);
+
+ return __w.ll;
+}