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[PULL,10/15] qemu-common.h: optimise muldiv64 if int128 is available

Message ID 1421228492-19856-11-git-send-email-pbonzini@redhat.com
State New
Headers show

Commit Message

Paolo Bonzini Jan. 14, 2015, 9:41 a.m. UTC 
From: Frediano Ziglio <freddy77@gmail.com>

Let compiler do the job to optimise the function.

Signed-off-by: Frediano Ziglio <frediano.ziglio@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
---
 include/qemu-common.h | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/include/qemu-common.h b/include/qemu-common.h
index f862214..644b46d 100644
--- a/include/qemu-common.h
+++ b/include/qemu-common.h
@@ -370,6 +370,12 @@  static inline uint8_t from_bcd(uint8_t val)
 }
 
 /* compute with 96 bit intermediate result: (a*b)/c */
+#ifdef CONFIG_INT128
+static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
+{
+    return (__int128_t)a * b / c;
+}
+#else
 static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
 {
     union {
@@ -392,6 +398,7 @@  static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
     res.l.low = (((rh % c) << 32) + (rl & 0xffffffff)) / c;
     return res.ll;
 }
+#endif
 
 /* Round number down to multiple */
 #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))