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Merged
skeeto merged 1 commit into from
Oct 27, 2026
+7 −6
Merged

Default to SSE2 floating point math on x86 #430

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4 changes: 2 additions & 2 deletions Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -239,7 +239,7 @@ RUN mkdir nsis \

FROM dl-cross AS variant-x64
ENV ARCH=x86_64-w64-mingw32 \
GCC_ARCH_FLAG=--with-arch-32=pentium4 \
GCC_ARCH_FLAG="--with-arch-32=pentium4 --with-fpmath=sse" \
GCC_MULTILIB=enable \
CRT_LIB32=enable \
CRT_LIB64=enable \
Expand All @@ -254,7 +254,7 @@ ENV ARCH=x86_64-w64-mingw32 \

FROM dl-cross AS variant-x86
ENV ARCH=i686-w64-mingw32 \
GCC_ARCH_FLAG=--with-arch=pentium4 \
GCC_ARCH_FLAG="--with-arch=pentium4 --with-fpmath=sse" \
GCC_MULTILIB=disable \
CRT_LIB32=enable \
CRT_LIB64=disable \
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9 changes: 5 additions & 4 deletions README.md
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Expand Up @@ -85,10 +85,11 @@ toolchain targets Windows 7 by default.

The x86 kit requires Windows XP or later and an SSE2-capable processor
(e.g. at least Pentium 4); limited Unicode support. The toolchain targets
the same by default. Runtimes contain SSE2 instructions, so GCC `-march`
will not reliably target less capable processors when runtimes are linked
(exceptions: `-lmemory`, `-lchkstk`). CMake, Ninja, and CCache require at
least Windows 7.
the same by default, with floating point math in SSE2 rather than x87
(`-mfpmath=sse`), as on x64. Runtimes contain SSE2 instructions, so GCC
`-march` will not reliably target less capable processors when runtimes
are linked (exceptions: `-lmemory`, `-lchkstk`). CMake, Ninja, and
CCache require at least Windows 7.

## Build cache

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