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Build: Detect whether compiler supports DSPr2

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This is basically the same test that was performed in acinclude.m4 in
the old autotools-based build system.  It was not ported to the
CMake-based build system because I previously had no way of testing
a non-DSPr2 build environment.

Fixes #248
This commit is contained in:
DRC
2018-06-29 12:45:57 -05:00
parent 398c1e9acc
commit 6d8caa9f88
2 changed files with 26 additions and 0 deletions
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3
ChangeLog.md
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@@ -44,6 +44,9 @@ subsampling (for instance, 4:2:0 or 4:4:0.)
a 4:2:2 or 4:2:0 JPEG image using the merged (non-fancy) upsampling algorithms a 4:2:2 or 4:2:0 JPEG image using the merged (non-fancy) upsampling algorithms
(that is, when setting `cinfo.do_fancy_upsampling` to `FALSE`.) (that is, when setting `cinfo.do_fancy_upsampling` to `FALSE`.)
7. The new CMake-based build system will now disable the MIPS DSPr2 SIMD
extensions if it detects that the compiler does not support DSPr2 instructions.
1.5.90 (2.0 beta1) 1.5.90 (2.0 beta1)
================== ==================

23
simd/CMakeLists.txt
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@@ -270,6 +270,29 @@ string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UC)
set(EFFECTIVE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${CMAKE_ASM_FLAGS_${CMAKE_BUILD_TYPE_UC}}") set(EFFECTIVE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${CMAKE_ASM_FLAGS_${CMAKE_BUILD_TYPE_UC}}")
message(STATUS "CMAKE_ASM_FLAGS = ${EFFECTIVE_ASM_FLAGS}") message(STATUS "CMAKE_ASM_FLAGS = ${EFFECTIVE_ASM_FLAGS}")
set(CMAKE_REQUIRED_FLAGS -mdspr2)
check_c_source_compiles("
#if !(defined(__mips__) && __mips_isa_rev >= 2)
#error MIPS DSPr2 is currently only available on MIPS32r2 platforms.
#endif
int main(void) {
int c = 0, a = 0, b = 0;
__asm__ __volatile__ (
\"precr.qb.ph %[c], %[a], %[b]\"
: [c] \"=r\" (c)
: [a] \"r\" (a), [b] \"r\" (b)
);
return c;
}" HAVE_DSPR2)
unset(CMAKE_REQUIRED_FLAGS)
if(NOT HAVE_DSPR2)
simd_fail("SIMD extensions not available for this CPU")
return()
endif()
add_library(simd OBJECT ${CPU_TYPE}/jsimd_dspr2.S ${CPU_TYPE}/jsimd.c) add_library(simd OBJECT ${CPU_TYPE}/jsimd_dspr2.S ${CPU_TYPE}/jsimd.c)
if(CMAKE_POSITION_INDEPENDENT_CODE OR ENABLE_SHARED) if(CMAKE_POSITION_INDEPENDENT_CODE OR ENABLE_SHARED)