From 7714a60ed1c9977fa85850d5106f8fcd70800b5b Mon Sep 17 00:00:00 2001
From: Tim Northover <tnorthover@apple.com>
Date: Fri, 18 Jul 2014 13:01:37 +0000
Subject: [PATCH] R600: support fpext/fptrunc operations to and from f16.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213376 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/R600/AMDGPUISelLowering.cpp |  4 ++++
 test/CodeGen/R600/half.ll              | 31 ++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/lib/Target/R600/AMDGPUISelLowering.cpp b/lib/Target/R600/AMDGPUISelLowering.cpp
index 42d2a13a398..c8120ae5c35 100644
--- a/lib/Target/R600/AMDGPUISelLowering.cpp
+++ b/lib/Target/R600/AMDGPUISelLowering.cpp
@@ -244,6 +244,10 @@ AMDGPUTargetLowering::AMDGPUTargetLowering(TargetMachine &TM) :
 
   setOperationAction(ISD::FP16_TO_FP, MVT::f64, Expand);
 
+  setLoadExtAction(ISD::EXTLOAD, MVT::f16, Expand);
+  setTruncStoreAction(MVT::f32, MVT::f16, Expand);
+  setTruncStoreAction(MVT::f64, MVT::f16, Expand);
+
   const MVT ScalarIntVTs[] = { MVT::i32, MVT::i64 };
   for (MVT VT : ScalarIntVTs) {
     setOperationAction(ISD::SREM, VT, Expand);
diff --git a/test/CodeGen/R600/half.ll b/test/CodeGen/R600/half.ll
index 58d3a1bdf47..42aa4faa99f 100644
--- a/test/CodeGen/R600/half.ll
+++ b/test/CodeGen/R600/half.ll
@@ -28,3 +28,34 @@ define void @test_bitcast_to_half(half addrspace(1)* %out, i16 addrspace(1)* %in
   store half %val_fp, half addrspace(1)* %out
   ret void
 }
+
+define void @test_extend32(half addrspace(1)* %in, float addrspace(1)* %out) {
+; CHECK-LABEL: @test_extend32
+; CHECK: V_CVT_F32_F16_e32
+
+  %val16 = load half addrspace(1)* %in
+  %val32 = fpext half %val16 to float
+  store float %val32, float addrspace(1)* %out
+  ret void
+}
+
+define void @test_extend64(half addrspace(1)* %in, double addrspace(1)* %out) {
+; CHECK-LABEL: @test_extend64
+; CHECK: V_CVT_F32_F16_e32
+; CHECK: V_CVT_F64_F32_e32
+
+  %val16 = load half addrspace(1)* %in
+  %val64 = fpext half %val16 to double
+  store double %val64, double addrspace(1)* %out
+  ret void
+}
+
+define void @test_trunc32(float addrspace(1)* %in, half addrspace(1)* %out) {
+; CHECK-LABEL: @test_trunc32
+; CHECK: V_CVT_F16_F32_e32
+
+  %val32 = load float addrspace(1)* %in
+  %val16 = fptrunc float %val32 to half
+  store half %val16, half addrspace(1)* %out
+  ret void
+}