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[Qemu-devel] [PULL 10/15] qemu-common.h: optimise muldiv64 if int128 is
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PULL 10/15] qemu-common.h: optimise muldiv64 if int128 is available |
Date: |
Wed, 14 Jan 2015 10:41:27 +0100 |
From: Frediano Ziglio <address@hidden>
Let compiler do the job to optimise the function.
Signed-off-by: Frediano Ziglio <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
Signed-off-by: Frediano Ziglio <address@hidden>
---
include/qemu-common.h | 7 +++++++
1 file changed, 7 insertions(+)
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))
--
1.8.3.1
- [Qemu-devel] [PULL 00/15] Misc patches for 2015-01-14, Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 02/15] vl.c: fix regression when reading machine type from config file, Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 03/15] 9pfs: changed to use event_notifier instead of qemu_pipe, Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 05/15] vl: fix max_cpus check, Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 08/15] target-i386: fix movntsd on big-endian hosts, Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 07/15] vl.c: fix regression when reading memory size from config file, Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 04/15] vl: Avoid unnecessary 'if' nesting, Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 01/15] char: restore stdio echo on resume from suspend., Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 09/15] target-i386: do not memcpy in and out of xmm_regs, Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 10/15] qemu-common.h: optimise muldiv64 if int128 is available,
Paolo Bonzini <=
- [Qemu-devel] [PULL 14/15] qemu-timer: rename timer_init to timer_init_tl, Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 15/15] cpus: consistently use QEMU_CLOCK_VIRTUAL_RT for icount_warp_rt timer, Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 13/15] scsi: fix cancellation when I/O was completed but DMA was not., Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 06/15] vl: Don't silently change topology when all -smp options were set, Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 11/15] hw/scsi/lsi53c895a: add support for additional diag / debug registers, Paolo Bonzini, 2015/01/14
- [Qemu-devel] [PULL 12/15] rules.mak: Fix module build, Paolo Bonzini, 2015/01/14
- Re: [Qemu-devel] [PULL 00/15] Misc patches for 2015-01-14, Peter Maydell, 2015/01/14