commit 2ff4b36a34e5f6abe1fbe695197fd4e66862339b
author William A. Kennington III <wak@google.com> Wed Jan 04 14:35:59 2023 -0800
committer William A. Kennington III <wak@google.com> Thu Jun 22 14:59:47 2023 -0700
tree f58729c3acf903b06b4e8094360e7a7e42043351
parent cda3c1e3fbb3e7d55ed464eb87e176b79d01913b

numeric/str: Improve base10 encode performance

This adds a generic mechanism for coalescing writes into multi-digit
chunks in order to reduce the number of division operations that
bottleneck the encoding process.

Change-Id: Iaf0967b2a44820c75cad73390b81a6a53d97b27a
Signed-off-by: William A. Kennington III <wak@google.com>

test/numeric/str.cpp

diff --git a/test/numeric/str.cpp b/test/numeric/str.cpp
index 5646045..008cbe5 100644
--- a/test/numeric/str.cpp
+++ b/test/numeric/str.cpp
@@ -10,7 +10,7 @@
 TEST(IntToStr, Uint8_10)
 {
     IntToStr<10, uint8_t> enc;
-    static_assert(enc.buf_size == 3);
+    static_assert(enc.buf_size == 4);
     char buf[enc.buf_size];
     EXPECT_EQ("0", std::string_view(buf, enc(buf, 0)));
     EXPECT_EQ("42", std::string_view(buf, enc(buf, 42)));
@@ -22,7 +22,7 @@
 TEST(IntToStr, Int8_10)
 {
     IntToStr<10, int8_t> enc;
-    static_assert(enc.buf_size == 4);
+    static_assert(enc.buf_size == 5);
     char buf[enc.buf_size];
     EXPECT_EQ("42", std::string_view(buf, enc(buf, 42)));
     EXPECT_EQ("-127", std::string_view(buf, enc(buf, -127)));
@@ -31,7 +31,7 @@
 TEST(IntToStr, Uint16_10)
 {
     IntToStr<10, uint16_t> enc;
-    static_assert(enc.buf_size == 5);
+    static_assert(enc.buf_size == 6);
     char buf[enc.buf_size];
     EXPECT_EQ("55255", std::string_view(buf, enc(buf, 55255, 3)));
 }