Emulate vector square root intrinsic.

Bug b/64034197

Change-Id: I2d77dcb2f93b21abeb0eac1dcb8ca02ef6e5796b
Reviewed-on: https://swiftshader-review.googlesource.com/10957
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

diff --git a/src/Reactor/SubzeroReactor.cpp b/src/Reactor/SubzeroReactor.cpp
index 6c2adf0..49163a7 100644 (file)
--- a/src/Reactor/SubzeroReactor.cpp
+++ b/src/Reactor/SubzeroReactor.cpp
@@ -6833,14 +6833,27 @@ namespace sw
 
        RValue<Float4> Sqrt(RValue<Float4> x)
        {
-               Ice::Variable *result = ::function->makeVariable(Ice::IceType_v4f32);
-               const Ice::Intrinsics::IntrinsicInfo intrinsic = {Ice::Intrinsics::Sqrt, Ice::Intrinsics::SideEffects_F, Ice::Intrinsics::ReturnsTwice_F, Ice::Intrinsics::MemoryWrite_F};
-               auto target = ::context->getConstantUndef(Ice::IceType_i32);
-               auto sqrt = Ice::InstIntrinsicCall::create(::function, 1, result, target, intrinsic);
-               sqrt->addArg(x.value);
-               ::basicBlock->appendInst(sqrt);
+               if(emulateIntrinsics)
+               {
+                       Float4 result;
+                       result.x = Sqrt(Float(Float4(x).x));
+                       result.y = Sqrt(Float(Float4(x).y));
+                       result.z = Sqrt(Float(Float4(x).z));
+                       result.w = Sqrt(Float(Float4(x).w));
 
-               return RValue<Float4>(V(result));
+                       return result;
+               }
+               else
+               {
+                       Ice::Variable *result = ::function->makeVariable(Ice::IceType_v4f32);
+                       const Ice::Intrinsics::IntrinsicInfo intrinsic = {Ice::Intrinsics::Sqrt, Ice::Intrinsics::SideEffects_F, Ice::Intrinsics::ReturnsTwice_F, Ice::Intrinsics::MemoryWrite_F};
+                       auto target = ::context->getConstantUndef(Ice::IceType_i32);
+                       auto sqrt = Ice::InstIntrinsicCall::create(::function, 1, result, target, intrinsic);
+                       sqrt->addArg(x.value);
+                       ::basicBlock->appendInst(sqrt);
+
+                       return RValue<Float4>(V(result));
+               }
        }
 
        RValue<Float4> Insert(RValue<Float4> x, RValue<Float> element, int i)