[llvm-branch-commits] [llvm] RuntimeLibcalls: Add libcall entries for sleef and armpl modf functions (PR #166985)

[Paul Kirth via llvm-branch-commits]

================
@@ -197,6 +201,55 @@ RuntimeLibcallsInfo::getFunctionTy(LLVMContext &Ctx, const Triple &TT,
                                                   fcNegNormal));
     return {FuncTy, Attrs};
   }
+  case RTLIB::impl__ZGVnN2vl8_modf:
+  case RTLIB::impl__ZGVnN4vl4_modff:
+  case RTLIB::impl__ZGVsNxvl8_modf:
+  case RTLIB::impl__ZGVsNxvl4_modff:
+  case RTLIB::impl_armpl_vmodfq_f64:
+  case RTLIB::impl_armpl_vmodfq_f32:
+  case RTLIB::impl_armpl_svmodf_f64_x:
+  case RTLIB::impl_armpl_svmodf_f32_x: {
+    AttrBuilder FuncAttrBuilder(Ctx);
+
+    bool IsF32 = LibcallImpl == RTLIB::impl__ZGVnN4vl4_modff ||
+                 LibcallImpl == RTLIB::impl__ZGVsNxvl4_modff ||
+                 LibcallImpl == RTLIB::impl_armpl_vmodfq_f32 ||
+                 LibcallImpl == RTLIB::impl_armpl_svmodf_f32_x;
+
+    bool IsScalable = LibcallImpl == RTLIB::impl__ZGVsNxvl8_modf ||
+                      LibcallImpl == RTLIB::impl__ZGVsNxvl4_modff ||
+                      LibcallImpl == RTLIB::impl_armpl_svmodf_f64_x ||
+                      LibcallImpl == RTLIB::impl_armpl_svmodf_f32_x;
+
+    Type *ScalarTy = IsF32 ? Type::getFloatTy(Ctx) : Type::getDoubleTy(Ctx);
+    unsigned EC = IsF32 ? 4 : 2;
----------------
ilovepi wrote:

This is the element count, right? was trying to find on sleef.org where these numbers come from, but I didn't see anything obvious documenting these in the library reference and other docs I skimmed. Are these derived from some other place, like a documented LLVM convention or HW constraint?

https://github.com/llvm/llvm-project/pull/166985