Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/CodeGen/X86/fast-isel-double-half-convertion.ll

@@ -0,0 +1,23 @@
+; RUN: llc -fast-isel -fast-isel-abort=1 -mtriple=x86_64-unknown-unknown -mattr=+f16c < %s
+
+; XFAIL: *
+
+; In the future, we might want to teach fast-isel how to expand a double-to-half
+; conversion into a double-to-float conversion immediately followed by a
+; float-to-half conversion. For now, fast-isel is expected to fail.
+
+define double @test_fp16_to_fp64(i32 %a) {
+entry:
+  %0 = trunc i32 %a to i16
+  %1 = call double @llvm.convert.from.fp16.f64(i16 %0)
+  ret float %0
+}
+
+define i16 @test_fp64_to_fp16(double %a) {
+entry:
+  %0 = call i16 @llvm.convert.to.fp16.f64(double %a)
+  ret i16 %0
+}
+
+declare i16 @llvm.convert.to.fp16.f64(double)
+declare double @llvm.convert.from.fp16.f64(i16)