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-rw-r--r--src/llvm_backend.cpp157
1 files changed, 82 insertions, 75 deletions
diff --git a/src/llvm_backend.cpp b/src/llvm_backend.cpp
index 276abc2d4..003424e0a 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"
+String get_default_microarchitecture() {
+ String default_march = str_lit("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 = str_lit("x86-64");
+ } else {
+ default_march = str_lit("x86-64-v2");
+ }
+ }
+ }
+ return default_march;
+}
gb_internal void lb_add_foreign_library_path(lbModule *m, Entity *e) {
if (e == nullptr) {
@@ -1478,8 +1497,6 @@ gb_internal WORKER_TASK_PROC(lb_llvm_module_pass_worker_proc) {
auto passes = array_make<char const *>(heap_allocator(), 0, 64);
defer (array_free(&passes));
-
-
LLVMPassBuilderOptionsRef pb_options = LLVMCreatePassBuilderOptions();
defer (LLVMDisposePassBuilderOptions(pb_options));
@@ -2486,40 +2503,72 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
LLVMCodeModel code_mode = LLVMCodeModelDefault;
if (is_arch_wasm()) {
code_mode = LLVMCodeModelJITDefault;
- } else if (build_context.metrics.os == TargetOs_freestanding) {
+ } else if (is_arch_x86() && build_context.metrics.os == TargetOs_freestanding) {
code_mode = LLVMCodeModelKernel;
}
- char const *host_cpu_name = LLVMGetHostCPUName();
- char const *llvm_cpu = "generic";
+ String host_cpu_name = copy_string(permanent_allocator(), make_string_c(LLVMGetHostCPUName()));
+ String llvm_cpu = get_default_microarchitecture();
char const *llvm_features = "";
if (build_context.microarch.len != 0) {
if (build_context.microarch == "native") {
llvm_cpu = host_cpu_name;
} else {
- llvm_cpu = alloc_cstring(permanent_allocator(), build_context.microarch);
+ llvm_cpu = copy_string(permanent_allocator(), build_context.microarch);
}
- if (gb_strcmp(llvm_cpu, host_cpu_name) == 0) {
+ if (llvm_cpu == host_cpu_name) {
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);
+ // Prefix all of the features with a `+`, because we are
+ // enabling additional features.
+ char const *additional_features = target_features_set_to_cstring(permanent_allocator(), false, true);
+
+ String f_string = make_string_c(llvm_features);
+ String a_string = make_string_c(additional_features);
+ isize f_len = f_string.len;
+
+ if (f_len == 0) {
+ // The common case is that llvm_features is empty, so
+ // the target_features_set additions can be used as is.
+ llvm_features = additional_features;
+ } else {
+ // The user probably specified `-microarch:native`, so
+ // llvm_features is populated by LLVM's idea of what
+ // the host CPU supports.
+ //
+ // As far as I can tell, (which is barely better than
+ // wild guessing), a bitset is formed by parsing the
+ // string left to right.
+ //
+ // So, llvm_features + ',' + additonal_features, will
+ // makes the target_features_set override llvm_features.
+
+ char *tmp = gb_alloc_array(permanent_allocator(), char, f_len + 1 + a_string.len + 1);
+ isize len = 0;
+
+ // tmp = f_string
+ gb_memmove(tmp, f_string.text, f_string.len);
+ len += f_string.len;
+ // tmp += ','
+ tmp[len++] = ',';
+ // tmp += a_string
+ gb_memmove(tmp + len, a_string.text, a_string.len);
+ len += a_string.len;
+ // tmp += NUL
+ tmp[len++] = 0;
+
+ llvm_features = tmp;
+ }
}
// GB_ASSERT_MSG(LLVMTargetHasAsmBackend(target));
@@ -2566,7 +2615,7 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
for (auto const &entry : gen->modules) {
LLVMTargetMachineRef target_machine = LLVMCreateTargetMachine(
- target, target_triple, llvm_cpu,
+ target, target_triple, (const char *)llvm_cpu.text,
llvm_features,
code_gen_level,
reloc_mode,
@@ -2685,64 +2734,22 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
}
}
- {
- char const *name = LB_TYPE_INFO_TYPES_NAME;
- Type *t = alloc_type_array(t_type_info_ptr, count);
- LLVMValueRef g = LLVMAddGlobal(m->mod, lb_type(m, t), name);
- LLVMSetInitializer(g, LLVMConstNull(lb_type(m, t)));
- LLVMSetLinkage(g, LLVMInternalLinkage);
- if (LB_USE_GIANT_PACKED_STRUCT) {
- lb_make_global_private_const(g);
- }
- lb_global_type_info_member_types = lb_addr({g, alloc_type_pointer(t)});
-
- }
- {
- char const *name = LB_TYPE_INFO_NAMES_NAME;
- Type *t = alloc_type_array(t_string, count);
- LLVMValueRef g = LLVMAddGlobal(m->mod, lb_type(m, t), name);
- LLVMSetInitializer(g, LLVMConstNull(lb_type(m, t)));
- LLVMSetLinkage(g, LLVMInternalLinkage);
- if (LB_USE_GIANT_PACKED_STRUCT) {
- lb_make_global_private_const(g);
- }
- lb_global_type_info_member_names = lb_addr({g, alloc_type_pointer(t)});
- }
- {
- char const *name = LB_TYPE_INFO_OFFSETS_NAME;
- Type *t = alloc_type_array(t_uintptr, count);
- LLVMValueRef g = LLVMAddGlobal(m->mod, lb_type(m, t), name);
- LLVMSetInitializer(g, LLVMConstNull(lb_type(m, t)));
- LLVMSetLinkage(g, LLVMInternalLinkage);
- if (LB_USE_GIANT_PACKED_STRUCT) {
- lb_make_global_private_const(g);
- }
- lb_global_type_info_member_offsets = lb_addr({g, alloc_type_pointer(t)});
- }
-
- {
- char const *name = LB_TYPE_INFO_USINGS_NAME;
- Type *t = alloc_type_array(t_bool, count);
+ auto const global_type_info_make = [](lbModule *m, char const *name, Type *elem_type, i64 count) -> lbAddr {
+ Type *t = alloc_type_array(elem_type, count);
LLVMValueRef g = LLVMAddGlobal(m->mod, lb_type(m, t), name);
LLVMSetInitializer(g, LLVMConstNull(lb_type(m, t)));
LLVMSetLinkage(g, LLVMInternalLinkage);
if (LB_USE_GIANT_PACKED_STRUCT) {
lb_make_global_private_const(g);
}
- lb_global_type_info_member_usings = lb_addr({g, alloc_type_pointer(t)});
- }
-
- {
- char const *name = LB_TYPE_INFO_TAGS_NAME;
- Type *t = alloc_type_array(t_string, count);
- LLVMValueRef g = LLVMAddGlobal(m->mod, lb_type(m, t), name);
- LLVMSetInitializer(g, LLVMConstNull(lb_type(m, t)));
- LLVMSetLinkage(g, LLVMInternalLinkage);
- if (LB_USE_GIANT_PACKED_STRUCT) {
- lb_make_global_private_const(g);
- }
- lb_global_type_info_member_tags = lb_addr({g, alloc_type_pointer(t)});
- }
+ return lb_addr({g, alloc_type_pointer(t)});
+ };
+
+ lb_global_type_info_member_types = global_type_info_make(m, LB_TYPE_INFO_TYPES_NAME, t_type_info_ptr, count);
+ lb_global_type_info_member_names = global_type_info_make(m, LB_TYPE_INFO_NAMES_NAME, t_string, count);
+ lb_global_type_info_member_offsets = global_type_info_make(m, LB_TYPE_INFO_OFFSETS_NAME, t_uintptr, count);
+ lb_global_type_info_member_usings = global_type_info_make(m, LB_TYPE_INFO_USINGS_NAME, t_bool, count);
+ lb_global_type_info_member_tags = global_type_info_make(m, LB_TYPE_INFO_TAGS_NAME, t_string, count);
}
}
generated by cgit v1.2.3 (git 2.39.1) at 2026-02-15 16:12:02 +0000