Added BMI and BMI2 intrinsics.

The BMI ones mostly aren't particularly interesting--they're mostly
trivially representable in-language--but PDEP and PEXT from BMI2 could
be.

core/simd/x86/bmi2.odin

@@ -0,0 +1,46 @@
+#+build i386, amd64
+package simd_x86
+
+@(require_results, enable_target_feature = "bmi2")
+_bzhi_u32 :: #force_inline proc "c" (a, index: u32) -> u32 {
+	return bzhi_u32(a, index)
+}
+@(require_results, enable_target_feature = "bmi2")
+_bzhi_u64 :: #force_inline proc "c" (a, index: u64) -> u64 {
+	return bzhi_u64(a, index)
+}
+
+@(require_results, enable_target_feature = "bmi2")
+_pdep_u32 :: #force_inline proc "c" (a, mask: u32) -> u32 {
+	return pdep_u32(a, mask)
+}
+@(require_results, enable_target_feature = "bmi2")
+_pdep_u64 :: #force_inline proc "c" (a, mask: u64) -> u64 {
+	return pdep_u64(a, mask)
+}
+
+@(require_results, enable_target_feature = "bmi2")
+_pext_u32 :: #force_inline proc "c" (a, mask: u32) -> u32 {
+	return pext_u32(a, mask)
+}
+@(require_results, enable_target_feature = "bmi2")
+_pext_u64 :: #force_inline proc "c" (a, mask: u64) -> u64 {
+	return pext_u64(a, mask)
+}
+
+
+@(private, default_calling_convention = "none")
+foreign _ {
+	@(link_name = "llvm.x86.bmi.bzhi.32")
+	bzhi_u32 :: proc(a, index: u32) -> u32 ---
+	@(link_name = "llvm.x86.bmi.bzhi.64")
+	bzhi_u64 :: proc(a, index: u64) -> u64 ---
+	@(link_name = "llvm.x86.bmi.pdep.32")
+	pdep_u32 :: proc(a, mask: u32) -> u32 ---
+	@(link_name = "llvm.x86.bmi.pdep.64")
+	pdep_u64 :: proc(a, mask: u64) -> u64 ---
+	@(link_name = "llvm.x86.bmi.pext.32")
+	pext_u32 :: proc(a, mask: u32) -> u32 ---
+	@(link_name = "llvm.x86.bmi.pext.64")
+	pext_u64 :: proc(a, mask: u64) -> u64 ---
+}