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field: force-inline 5x52 mul and sqr

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The 5x52 field multiplication and squaring routines are hot in group arithmetic and scalar multiplication.

Use the new `SECP256K1_FORCE_INLINE` for the thin wrappers and `int128` inner helpers so compilers can schedule the 64x64->128 arithmetic without a call boundary.

Across the measured GCC and MSVC Release builds, this improves ECDSA verification by 0.6% to 9.1%, ECDH by 0.7% to 9.3%, and Schnorr verification by 0.6% to 9.6%.

The direct field benchmarks generally show the intended effect on field squaring and multiplication, while Clang results are mostly flat and less consistently positive.

This is a code-size tradeoff: the tested static library builds grew by about 4.6% to 4.7%, and the tested Windows Release DLL grew by 14.1%.

Co-authored-by: Sebastian Falbesoner <sebastian.falbesoner@gmail.com>
Co-authored-by: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
Co-authored-by: Tim Ruffing <crypto@timruffing.de>
This commit is contained in:
Lőrinc
2026-05-29 13:03:42 +02:00
parent aea86bc350
commit 71fcd8410e
4 changed files with 17 additions and 4 deletions
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CMakeLists.txt
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@@ -147,6 +147,8 @@ if(MSVC)
string(REGEX REPLACE "/DNDEBUG[ \t\r\n]*" "" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
string(REGEX REPLACE "/DNDEBUG[ \t\r\n]*" "" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
string(REGEX REPLACE "/DNDEBUG[ \t\r\n]*" "" CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL}")
# Match GCC/Clang's size-optimization macro for the inline guard
add_compile_definitions($<$<CONFIG:MinSizeRel>:__OPTIMIZE_SIZE__=1>)
else()
string(REGEX REPLACE "-DNDEBUG[ \t\r\n]*" "" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
string(REGEX REPLACE "-DNDEBUG[ \t\r\n]*" "" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")