[llvm] [IR] Add intrinsics to represent complex multiply and divide operations (PR #68742)

[Simon Pilgrim via llvm-commits]

================
@@ -0,0 +1,173 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=i386-linux-gnu -mattr=+sse2 | FileCheck %s
+
+; Check that we handle the ABI of the complex functions correctly for 32-bit.
+
+declare <2 x half> @llvm.experimental.complex.fmul.v2f16(<2 x half>, <2 x half>)
+declare <2 x float> @llvm.experimental.complex.fmul.v2f32(<2 x float>, <2 x float>)
+declare <2 x double> @llvm.experimental.complex.fmul.v2f64(<2 x double>, <2 x double>)
+declare <2 x x86_fp80> @llvm.experimental.complex.fmul.v2f80(<2 x x86_fp80>, <2 x x86_fp80>)
+declare <2 x fp128> @llvm.experimental.complex.fmul.v2f128(<2 x fp128>, <2 x fp128>)
+
+define <2 x half> @intrinsic_f16(<2 x half> %z, <2 x half> %w) {
----------------
RKSimon wrote:

add nounwind to avoid the cfi noise

https://github.com/llvm/llvm-project/pull/68742