From: "Tang, Jun" <juntangc@amazon.com>
To: 'GNU C Library' <libc-alpha@sourceware.org>
Subject: [PATCH v2] AArch64: Fix HP_TIMING_DIFF computation
Date: Wed, 8 Feb 2023 15:57:46 +0000 [thread overview]
Message-ID: <973fda3c2f5b4d71b205c853e4b34af9@amazon.com> (raw)
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Attached is the updated patch that allows max execution time to be 1024 seconds before overflowing.
Link to the bug report - https://sourceware.org/bugzilla/show_bug.cgi?id=29329.
Regards,
Jun
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diff --git a/sysdeps/aarch64/hp-timing.h b/sysdeps/aarch64/hp-timing.h
index f7f7ac7cae..7c6be072c4 100644
--- a/sysdeps/aarch64/hp-timing.h
+++ b/sysdeps/aarch64/hp-timing.h
@@ -41,7 +41,7 @@ typedef uint64_t hp_timing_t;
#define HP_TIMING_DIFF(Diff, Start, End) \
({ hp_timing_t freq; \
__asm__ __volatile__ ("mrs %0, cntfrq_el0" : "=r" (freq)); \
- (Diff) = ((End) - (Start)) * (UINT64_C(1000000000) / freq); \
+ (Diff) = (((End) - (Start)) * UINT64_C(1000000000 >> 6)) / (freq >> 6); \
})
#endif /* hp-timing.h */
next reply other threads:[~2023-02-08 15:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-08 15:57 Tang, Jun [this message]
2023-02-17 16:44 ` Tang, Jun
2023-02-22 17:27 Wilco Dijkstra
2023-02-22 17:29 ` Tang, Jun
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