From efe05076323f5c6bafece109e21cce046f5e4b07 Mon Sep 17 00:00:00 2001
From: grahameth <96447521+grahameth@users.noreply.github.com>
Date: Mon, 5 Jun 2023 22:11:49 +0200
Subject: [PATCH] ggml : fix internal overflow in ggml_time_us on Windows
 (#1702)

Co-authored-by: grahameth <->
---
 ggml.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/ggml.c b/ggml.c
index 7f9bff995..24f0d2fad 100644
--- a/ggml.c
+++ b/ggml.c
@@ -404,21 +404,27 @@ void ggml_fp32_to_fp16_row(const float * x, ggml_fp16_t * y, size_t n) {
 //
 
 #if defined(_MSC_VER) || defined(__MINGW32__)
-static int64_t timer_freq;
+static int64_t timer_freq, timer_start;
 void ggml_time_init(void) {
-    LARGE_INTEGER frequency;
-    QueryPerformanceFrequency(&frequency);
-    timer_freq = frequency.QuadPart;
+    LARGE_INTEGER t;
+    QueryPerformanceFrequency(&t);
+    timer_freq = t.QuadPart;
+
+    // The multiplication by 1000 or 1000000 below can cause an overflow if timer_freq
+    // and the uptime is high enough.
+    // We subtract the program start time to reduce the likelihood of that happening.
+    QueryPerformanceCounter(&t);
+    timer_start = t.QuadPart;
 }
 int64_t ggml_time_ms(void) {
     LARGE_INTEGER t;
     QueryPerformanceCounter(&t);
-    return (t.QuadPart * 1000) / timer_freq;
+    return ((t.QuadPart-timer_start) * 1000) / timer_freq;
 }
 int64_t ggml_time_us(void) {
     LARGE_INTEGER t;
     QueryPerformanceCounter(&t);
-    return (t.QuadPart * 1000000) / timer_freq;
+    return ((t.QuadPart-timer_start) * 1000000) / timer_freq;
 }
 #else
 void ggml_time_init(void) {}