diff options
Diffstat (limited to 'src/llvm_backend.cpp')
| -rw-r--r-- | src/llvm_backend.cpp | 42 |
1 files changed, 27 insertions, 15 deletions
diff --git a/src/llvm_backend.cpp b/src/llvm_backend.cpp index 276abc2d4..effd9d28e 100644 --- a/src/llvm_backend.cpp +++ b/src/llvm_backend.cpp @@ -21,6 +21,25 @@ #include "llvm_backend_stmt.cpp" #include "llvm_backend_proc.cpp" +char *get_default_microarchitecture() { + char * default_march = "generic"; + if (build_context.metrics.arch == TargetArch_amd64) { + // NOTE(bill): x86-64-v2 is more than enough for everyone + // + // x86-64: CMOV, CMPXCHG8B, FPU, FXSR, MMX, FXSR, SCE, SSE, SSE2 + // x86-64-v2: (close to Nehalem) CMPXCHG16B, LAHF-SAHF, POPCNT, SSE3, SSE4.1, SSE4.2, SSSE3 + // x86-64-v3: (close to Haswell) AVX, AVX2, BMI1, BMI2, F16C, FMA, LZCNT, MOVBE, XSAVE + // x86-64-v4: AVX512F, AVX512BW, AVX512CD, AVX512DQ, AVX512VL + if (ODIN_LLVM_MINIMUM_VERSION_12) { + if (build_context.metrics.os == TargetOs_freestanding) { + default_march = "x86-64"; + } else { + default_march = "x86-64-v2"; + } + } + } + return default_march; +} gb_internal void lb_add_foreign_library_path(lbModule *m, Entity *e) { if (e == nullptr) { @@ -2491,7 +2510,7 @@ gb_internal bool lb_generate_code(lbGenerator *gen) { } char const *host_cpu_name = LLVMGetHostCPUName(); - char const *llvm_cpu = "generic"; + char const *llvm_cpu = get_default_microarchitecture(); char const *llvm_features = ""; if (build_context.microarch.len != 0) { if (build_context.microarch == "native") { @@ -2502,22 +2521,15 @@ gb_internal bool lb_generate_code(lbGenerator *gen) { if (gb_strcmp(llvm_cpu, host_cpu_name) == 0) { llvm_features = LLVMGetHostCPUFeatures(); } - } else if (build_context.metrics.arch == TargetArch_amd64) { - // NOTE(bill): x86-64-v2 is more than enough for everyone - // - // x86-64: CMOV, CMPXCHG8B, FPU, FXSR, MMX, FXSR, SCE, SSE, SSE2 - // x86-64-v2: (close to Nehalem) CMPXCHG16B, LAHF-SAHF, POPCNT, SSE3, SSE4.1, SSE4.2, SSSE3 - // x86-64-v3: (close to Haswell) AVX, AVX2, BMI1, BMI2, F16C, FMA, LZCNT, MOVBE, XSAVE - // x86-64-v4: AVX512F, AVX512BW, AVX512CD, AVX512DQ, AVX512VL - if (ODIN_LLVM_MINIMUM_VERSION_12) { - if (build_context.metrics.os == TargetOs_freestanding) { - llvm_cpu = "x86-64"; - } else { - llvm_cpu = "x86-64-v2"; - } - } } + // NOTE(Jeroen): Uncomment to get the list of supported microarchitectures. + /* + if (build_context.microarch == "?") { + string_set_add(&build_context.target_features_set, str_lit("+cpuhelp")); + } + */ + if (build_context.target_features_set.entries.count != 0) { llvm_features = target_features_set_to_cstring(permanent_allocator(), false); } |