From 8dbafe7764f7c69a0ee8e75df52c3f3762dd81b4 Mon Sep 17 00:00:00 2001
From: tpoisonooo <khj.application@aliyun.com>
Date: Sat, 14 Sep 2019 14:06:43 +0800
Subject: [PATCH] constraint input value to [-127, +127] (#1258)

* constraint input value to [-127, +127]

* keep new line at the end
---
 src/layer/arm/convolution_1x1_int8.h          | 2 +-
 src/layer/arm/convolutiondepthwise_3x3_int8.h | 2 +-
 src/layer/arm/quantize_arm.cpp                | 2 +-
 src/layer/arm/requantize_arm.cpp              | 2 +-
 src/layer/quantize.cpp                        | 2 +-
 src/layer/requantize.cpp                      | 2 +-
 src/layer/x86/convolution_sgemm_int8.h        | 2 +-
 src/layer/x86/convolutiondepthwise_3x3_int8.h | 2 +-
 tools/caffe/caffe2ncnn.cpp                    | 4 ++--
 9 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/src/layer/arm/convolution_1x1_int8.h b/src/layer/arm/convolution_1x1_int8.h
index c2e74820e..f21bd27c4 100644
--- a/src/layer/arm/convolution_1x1_int8.h
+++ b/src/layer/arm/convolution_1x1_int8.h
@@ -19,7 +19,7 @@ static inline signed char float2int8(float v)
 {
     int int32 = round(v);
     if (int32 > 127) return 127;
-    if (int32 < -128) return -128;
+    if (int32 < -127) return -127;
     return (signed char)int32;
 }
 
diff --git a/src/layer/arm/convolutiondepthwise_3x3_int8.h b/src/layer/arm/convolutiondepthwise_3x3_int8.h
index 75cd781f1..44d69c123 100644
--- a/src/layer/arm/convolutiondepthwise_3x3_int8.h
+++ b/src/layer/arm/convolutiondepthwise_3x3_int8.h
@@ -16,7 +16,7 @@ static inline signed char float2int8(float v)
 {
     int int32 = round(v);
     if (int32 > 127) return 127;
-    if (int32 < -128) return -128;
+    if (int32 < -127) return -127;
     return (signed char)int32;
 }
 
diff --git a/src/layer/arm/quantize_arm.cpp b/src/layer/arm/quantize_arm.cpp
index 8771ac553..dc47c74f6 100644
--- a/src/layer/arm/quantize_arm.cpp
+++ b/src/layer/arm/quantize_arm.cpp
@@ -25,7 +25,7 @@ static inline signed char float2int8(float v)
 {
     int int32 = round(v);
     if (int32 > 127) return 127;
-    if (int32 < -128) return -128;
+    if (int32 < -127) return -127;
     return (signed char)int32;
 }
 
diff --git a/src/layer/arm/requantize_arm.cpp b/src/layer/arm/requantize_arm.cpp
index 743605b10..d867b276e 100644
--- a/src/layer/arm/requantize_arm.cpp
+++ b/src/layer/arm/requantize_arm.cpp
@@ -28,7 +28,7 @@ static inline signed char float2int8(float v)
 {
     int int32 = round(v);
     if (int32 > 127) return 127;
-    if (int32 < -128) return -128;
+    if (int32 < -127) return -127;
     return (signed char)int32;
 }
 
diff --git a/src/layer/quantize.cpp b/src/layer/quantize.cpp
index a140e32d3..ee368f8ae 100644
--- a/src/layer/quantize.cpp
+++ b/src/layer/quantize.cpp
@@ -37,7 +37,7 @@ static inline signed char float2int8(float v)
 {
     int int32 = round(v);
     if (int32 > 127) return 127;
-    if (int32 < -128) return -128;
+    if (int32 < -127) return -127;
     return (signed char)int32;
 }
 
diff --git a/src/layer/requantize.cpp b/src/layer/requantize.cpp
index 3709d6cd8..9f51d5237 100644
--- a/src/layer/requantize.cpp
+++ b/src/layer/requantize.cpp
@@ -31,7 +31,7 @@ static inline signed char float2int8(float v)
 {
     int int32 = round(v);
     if (int32 > 127) return 127;
-    if (int32 < -128) return -128;
+    if (int32 < -127) return -127;
     return (signed char)int32;
 }
 
diff --git a/src/layer/x86/convolution_sgemm_int8.h b/src/layer/x86/convolution_sgemm_int8.h
index b85344609..5adf4acf5 100644
--- a/src/layer/x86/convolution_sgemm_int8.h
+++ b/src/layer/x86/convolution_sgemm_int8.h
@@ -16,7 +16,7 @@ static inline signed char float2int8(float v)
 {
     int int32 = round(v);
     if (int32 > 127) return 127;
-    if (int32 < -128) return -128;
+    if (int32 < -127) return -127;
     return (signed char)int32;
 }
 
diff --git a/src/layer/x86/convolutiondepthwise_3x3_int8.h b/src/layer/x86/convolutiondepthwise_3x3_int8.h
index 0449a25bf..1c2c34a8f 100644
--- a/src/layer/x86/convolutiondepthwise_3x3_int8.h
+++ b/src/layer/x86/convolutiondepthwise_3x3_int8.h
@@ -16,7 +16,7 @@ static inline signed char float2int8(float v)
 {
     int int32 = round(v);
     if (int32 > 127) return 127;
-    if (int32 < -128) return -128;
+    if (int32 < -127) return -127;
     return (signed char)int32;
 }
 
diff --git a/tools/caffe/caffe2ncnn.cpp b/tools/caffe/caffe2ncnn.cpp
index c236a1c80..12f28e2e5 100644
--- a/tools/caffe/caffe2ncnn.cpp
+++ b/tools/caffe/caffe2ncnn.cpp
@@ -108,8 +108,8 @@ static signed char float2int8(float value)
 
     if (tmp > 127)
         return 127;
-    if (tmp < -128)
-        return -128;
+    if (tmp < -127)
+        return -127;
 
     return tmp;
 }