[clang] LoongArch fp16,fp128 basic support (PR #68851)

[via cfe-commits]

https://github.com/Xinmudotmoe updated https://github.com/llvm/llvm-project/pull/68851

>From 2ef1ddfb977da35f31f1f351ac4daf0478fff166 Mon Sep 17 00:00:00 2001
From: xinmu <xinmu at xinmu.moe>
Date: Thu, 12 Oct 2023 13:36:34 +0800
Subject: [PATCH 1/2] LoongArch fp16,fp128 basic support

---
 clang/lib/Basic/Targets/LoongArch.h                 | 2 ++
 clang/test/CodeGen/fp16-ops.c                       | 1 +
 llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp | 7 +++++++
 3 files changed, 10 insertions(+)

diff --git a/clang/lib/Basic/Targets/LoongArch.h b/clang/lib/Basic/Targets/LoongArch.h
index ba7fb78ab94cd23..b25857207acdedd 100644
--- a/clang/lib/Basic/Targets/LoongArch.h
+++ b/clang/lib/Basic/Targets/LoongArch.h
@@ -40,6 +40,8 @@ class LLVM_LIBRARY_VISIBILITY LoongArchTargetInfo : public TargetInfo {
     SuitableAlign = 128;
     WCharType = SignedInt;
     WIntType = UnsignedInt;
+    HasFloat128 = true;
+    HasFloat16 = true;
   }
 
   bool setCPU(const std::string &Name) override {
diff --git a/clang/test/CodeGen/fp16-ops.c b/clang/test/CodeGen/fp16-ops.c
index 0626e0aaed9d0c0..e230011a59402d4 100644
--- a/clang/test/CodeGen/fp16-ops.c
+++ b/clang/test/CodeGen/fp16-ops.c
@@ -2,6 +2,7 @@
 // RUN: %clang_cc1 -emit-llvm -o - -triple arm-none-linux-gnueabi %s | FileCheck %s --check-prefix=NOTNATIVE --check-prefix=CHECK
 // RUN: %clang_cc1 -emit-llvm -o - -triple aarch64-none-linux-gnueabi %s | FileCheck %s --check-prefix=NOTNATIVE --check-prefix=CHECK
 // RUN: %clang_cc1 -emit-llvm -o - -triple x86_64-linux-gnu %s | FileCheck %s --check-prefix=NOTNATIVE --check-prefix=CHECK
+// RUN: %clang_cc1 -emit-llvm -o - -triple loongarch64-linux-gnu %s | FileCheck %s --check-prefix=NOTNATIVE --check-prefix=CHECK
 // RUN: %clang_cc1 -emit-llvm -o - -triple arm-none-linux-gnueabi -fnative-half-type %s \
 // RUN:   | FileCheck %s --check-prefix=NATIVE-HALF
 // RUN: %clang_cc1 -emit-llvm -o - -triple aarch64-none-linux-gnueabi -fnative-half-type %s \
diff --git a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
index 7d01887f24c1597..0295389e1a92e4c 100644
--- a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
+++ b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
@@ -214,6 +214,13 @@ LoongArchTargetLowering::LoongArchTargetLowering(const TargetMachine &TM,
       setOperationAction(ISD::FRINT, MVT::f64, Legal);
   }
 
+  setOperationAction(ISD::FP16_TO_FP,        MVT::f32,   Expand);
+  setOperationAction(ISD::FP_TO_FP16,        MVT::f32,   Expand);
+  setTruncStoreAction(MVT::f32, MVT::f16, Expand);
+  setLoadExtAction(ISD::EXTLOAD, MVT::f32, MVT::f16, Expand);
+  setLibcallName(RTLIB::FPEXT_F16_F32, "__extendhfsf2");
+  setLibcallName(RTLIB::FPROUND_F32_F16, "__truncsfhf2");
+
   // Set operations for 'LSX' feature.
 
   if (Subtarget.hasExtLSX())

>From d198dc7d6086fdd918529d6349b33169cbf59624 Mon Sep 17 00:00:00 2001
From: xinmu <xinmu at xinmu.moe>
Date: Thu, 12 Oct 2023 18:02:53 +0800
Subject: [PATCH 2/2] fix whitespaces lint

---
 llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
index 0295389e1a92e4c..f03f09127866483 100644
--- a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
+++ b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
@@ -214,8 +214,8 @@ LoongArchTargetLowering::LoongArchTargetLowering(const TargetMachine &TM,
       setOperationAction(ISD::FRINT, MVT::f64, Legal);
   }
 
-  setOperationAction(ISD::FP16_TO_FP,        MVT::f32,   Expand);
-  setOperationAction(ISD::FP_TO_FP16,        MVT::f32,   Expand);
+  setOperationAction(ISD::FP16_TO_FP, MVT::f32, Expand);
+  setOperationAction(ISD::FP_TO_FP16, MVT::f32, Expand);
   setTruncStoreAction(MVT::f32, MVT::f16, Expand);
   setLoadExtAction(ISD::EXTLOAD, MVT::f32, MVT::f16, Expand);
   setLibcallName(RTLIB::FPEXT_F16_F32, "__extendhfsf2");