Integrating fast_float to optionally replace strtod

.github/workflows/ci.yml

@@ -34,6 +34,24 @@ jobs:
         run: |
           ./src/valkey-unit-tests
 
+  test-ubuntu-latest-fast-float:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - name: make
+        # Fail build if there are warnings
+        # build with TLS and FAST_FLOAT just for compilation coverage
+        run: make -j4 all-with-unit-tests SERVER_CFLAGS='-Werror' BUILD_TLS=yes USE_FAST_FLOAT=yes
+      - name: test
+        run: |
+          sudo apt-get install tcl8.6 tclx
+          ./runtest --verbose --tags -slow --dump-logs
+      - name: module api test
+        run: CFLAGS='-Werror' ./runtest-moduleapi --verbose --dump-logs
+      - name: unit tests
+        run: |
+          ./src/valkey-unit-tests
+
   test-ubuntu-latest-cmake:
     runs-on: ubuntu-latest
     steps:
@@ -110,6 +128,13 @@ jobs:
       - name: make
         run: make -j3 all-with-unit-tests SERVER_CFLAGS='-Werror'
 
+  build-macos-latest-fast-float:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - name: make
+        run: make -j3 all-with-unit-tests SERVER_CFLAGS='-Werror' USE_FAST_FLOAT=yes
+
   build-32bit:
     runs-on: ubuntu-latest
     steps:
@@ -119,6 +144,13 @@ jobs:
           sudo apt-get update && sudo apt-get install libc6-dev-i386
           make -j4 SERVER_CFLAGS='-Werror' 32bit
 
+  build-32bit-fast-float:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - name: make
+        run: "# Fast float requires C++ 32-bit libraries to compile on 64-bit ubuntu machine i.e. \"-cross\" suffixed version. \n# Cross-compiling c++ to 32-bit also requires multilib support for g++ compiler i.e. \"-multilib\" suffixed version of g++.\n# g++-multilib should generally include libstdc++.*cross version as well, but also added explicitly just in case. \nsudo apt-get update && sudo apt-get install libc6-dev-i386 libstdc++-11-dev-i386-cross gcc-multilib g++-multilib\nmake -j4 SERVER_CFLAGS='-Werror' 32bit USE_FAST_FLOAT=yes\n#magic___^_^___line\n"
+
   build-libc-malloc:
     runs-on: ubuntu-latest
     steps:
@@ -137,6 +169,17 @@ jobs:
           dnf -y install epel-release gcc make procps-ng which
           make -j4 SERVER_CFLAGS='-Werror'
 
+  build-almalinux8-jemalloc-fast-float:
+    runs-on: ubuntu-latest
+    container: almalinux:8
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+
+      - name: make
+        run: |
+          dnf -y install epel-release gcc gcc-c++ make procps-ng which
+          make -j4 SERVER_CFLAGS='-Werror' USE_FAST_FLOAT=yes
+
   format-yaml:
     runs-on: ubuntu-latest
     steps:

deps/Makefile

@@ -42,6 +42,7 @@ distclean:
 	-(cd jemalloc && [ -f Makefile ] && $(MAKE) distclean) > /dev/null || true
 	-(cd hdr_histogram && $(MAKE) clean) > /dev/null || true
 	-(cd fpconv && $(MAKE) clean) > /dev/null || true
+	-(cd fast_float_c_interface && $(MAKE) clean) > /dev/null || true
 	-(rm -f .make-*)
 
 .PHONY: distclean
@@ -116,3 +117,9 @@ jemalloc: .make-prerequisites
 	cd jemalloc && $(MAKE) lib/libjemalloc.a
 
 .PHONY: jemalloc
+
+fast_float_c_interface: .make-prerequisites
+	@printf '%b %b\n' $(MAKECOLOR)MAKE$(ENDCOLOR) $(BINCOLOR)$@$(ENDCOLOR)
+	cd fast_float_c_interface && $(MAKE)
+
+.PHONY: fast_float_c_interface

deps/README.md

@@ -6,6 +6,7 @@ should be provided by the operating system.
 * **linenoise** is a readline replacement. It is developed by the same authors of Valkey but is managed as a separated project and updated as needed.
 * **lua** is Lua 5.1 with minor changes for security and additional libraries.
 * **hdr_histogram** Used for per-command latency tracking histograms.
+* **fast_float** is a replacement for strtod to convert strings to floats efficiently. 
 
 How to upgrade the above dependencies
 ===
@@ -105,3 +106,17 @@ We use a customized version based on master branch commit e4448cf6d1cd08fff51981
 2. Copy updated files from newer version onto files in /hdr_histogram.
 3. Apply the changes from 1 above to the updated files.
 
+fast_float
+---
+The fast_float library provides fast header-only implementations for the C++ from_chars functions for `float` and `double` types as well as integer types.  These functions convert ASCII strings representing decimal values (e.g., `1.3e10`) into binary types. The functions are much faster than comparable number-parsing functions from existing C++ standard libraries.
+
+Specifically, `fast_float` provides the following function to parse floating-point numbers with a C++17-like syntax (the library itself only requires C++11):
+
+    template <typename T, typename UC = char, typename = FASTFLOAT_ENABLE_IF(is_supported_float_type<T>())>
+    from_chars_result_t<UC> from_chars(UC const *first, UC const *last, T &value, chars_format fmt = chars_format::general);
+
+To upgrade the library,
+1. Check out https://github.com/fastfloat/fast_float/tree/main
+2. cd fast_float
+3. Invoke "python3 ./script/amalgamate.py --output fast_float.h"
+4. Copy fast_float.h file to "deps/fast_float/".