Don't generate (S)SSE3 instructions in static code.

-march=core2 implies support for both the SSE3 and SSSE3 instruction set extensions. Chrome should run on CPUs with only SSE2 as well. Also, make use of SSE on x86-32 for floating-point operations, to be consistent with x86-64, and don't favor any specific architecture for tuning. Bug chromium:797763 Change-Id: Ia17428734460ed855f3aa0f83c6d2f6b3775094c Reviewed-on: https://swiftshader-review.googlesource.com/15688Tested-by: Nicolas Capens <nicolascapens@google.com> Reviewed-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com>

Don't generate (S)SSE3 instructions in static code.
0424edcb · Nicolas Capens · Nicolas Capens · 7bc079c2 · 0424edcb · 0424edcb
Commit 0424edcb authored Jan 03, 2018 by Nicolas Capens Committed by Nicolas Capens Jan 03, 2018
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Showing with 10 additions and 4 deletions

BUILD.gn BUILD.gn +5 -2

CMakeLists.txt CMakeLists.txt +5 -2

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--- a/BUILD.gn
+++ b/BUILD.gn
@@ -74,13 +74,16 @@ config("swiftshader_config") {
      cflags += [
        "-m64",
        "-fPIC",
-        "-march=core2",
+        "-march=x86-64",
+        "-mtune=generic",
      ]
    } else {  # 32 bit version
      cflags += [
        "-m32",
        "-msse2",
-        "-march=i686",
+        "-mfpmath=sse",
+        "-march=pentium4",
+        "-mtune=generic",
      ]
    }


--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -166,12 +166,15 @@ else()
    if(ARCH EQUAL "x86")
        set_cpp_flag("-m32")
        set_cpp_flag("-msse2")
-        set_cpp_flag("-march=i686")
+        set_cpp_flag("-mfpmath=sse")
+        set_cpp_flag("-march=pentium4")
+        set_cpp_flag("-mtune=generic")
    endif()
    if(ARCH EQUAL "x86_64")
        set_cpp_flag("-m64")
        set_cpp_flag("-fPIC")
-        set_cpp_flag("-march=core2")
+        set_cpp_flag("-march=x86-64")
+        set_cpp_flag("-mtune=generic")
    endif()

    # Use -g3 to have even more debug info