Add offload-test-suite support for ldexp (#200)

Closes #95.

- Test for Half type (`ldexp.fp16.test`)
- Test for 32 bit types (`ldexp.32.test`)

Author: kmpeng

test/Feature/HLSLLib/ldexp.16.test

@@ -0,0 +1,79 @@
+#--- source.hlsl
+
+StructuredBuffer<half4> In : register(t0);
+RWStructuredBuffer<half4> Out : register(u1);
+
+[numthreads(1,1,1)]
+void main() {
+  // X             Exp
+  // ------------------
+  // 0x4248        0x8000
+  // 0x0000        0x3C00
+  // 0xFC00        0xB800
+  // 0x7E00        0x7C00
+  // 0x8000        0x3C00
+  // 0x3C00        0x0000
+  // 0xB800        0xFC00
+  // 0x7C00        0x7E00
+  // 0x4248        0xB800
+  // 0x0000        0x7C00
+  // 0x3C00        0x4C00 (overflow)
+  // 0x3C00        0xCE40 (underflow)
+  Out[0] = ldexp(In[0], In[1]);
+  Out[1].x = ldexp(In[1].x, In[1].y);
+  Out[1].yzw = ldexp(In[1].yzw, In[0].yzw);
+  Out[2].xy = ldexp(In[0].xy, In[1].zw);
+  Out[2].zw = ldexp(In[2].xy, In[2].zw);
+}
+
+//--- pipeline.yaml
+
+---
+Shaders:
+  - Stage: Compute
+    Entry: main
+    DispatchSize: [1, 1, 1]
+Buffers:
+  - Name: In
+    Format: Float16
+    Stride: 8
+    Data: [ 0x4248, 0x0000, 0xFC00, 0x7E00, 0x8000, 0x3C00, 0xB800, 0x7C00, 0x3C00, 0x3C00, 0x4C00, 0xCE40 ] # [ 3.140625, 0, -inf, NaN, -0, 1, -0.5, inf, 1, 1, 16, -25 ]
+  - Name: Out
+    Format: Float16
+    Stride: 8
+    ZeroInitSize: 24
+  - Name: ExpectedOut # The result we expect
+    Format: Float16
+    Stride: 8
+    Data: [ 0x4248, 0x0000, 0xFC00, 0x7E00, 0x8000, 0x3C00, 0x8000, 0x7E00, 0x4071, 0x7E00, 0x7C00, 0x0000 ] # [ 3.140625, 0, -inf, NaN, -0, 1, -0, NaN, 2.220703, NaN, inf, 0 ]
+Results:
+  - Result: Test1
+    Rule: BufferFuzzy
+    ULPT: 1
+    Actual: Out
+    Expected: ExpectedOut
+DescriptorSets:
+  - Resources:
+    - Name: In
+      Kind: StructuredBuffer
+      DirectXBinding:
+        Register: 0
+        Space: 0
+      VulkanBinding:
+        Binding: 0
+    - Name: Out
+      Kind: RWStructuredBuffer
+      DirectXBinding:
+        Register: 1
+        Space: 0
+      VulkanBinding:
+        Binding: 1
+...
+#--- end
+
+# REQUIRES: Half
+
+# UNSUPPORTED: Clang-Vulkan
+# RUN: split-file %s %t
+# RUN: %dxc_target -enable-16bit-types -T cs_6_5 -Fo %t.o %t/source.hlsl
+# RUN: %offloader %t/pipeline.yaml %t.o

test/Feature/HLSLLib/ldexp.32.test

@@ -0,0 +1,77 @@
+#--- source.hlsl
+
+StructuredBuffer<float4> In : register(t0);
+RWStructuredBuffer<float4> Out : register(u1);
+
+[numthreads(1,1,1)]
+void main() {
+  // X             Exp
+  // ------------------
+  // 3.14159       -0
+  // 0             1
+  // -inf          -0.5
+  // NaN           inf
+  // -0            1
+  // 1             0
+  // -0.5          -inf
+  // inf           NaN
+  // 3.14159       -0.5
+  // 0             inf
+  // 1             128 (overflow)
+  // 1             -150 (underflow)
+  Out[0] = ldexp(In[0], In[1]);
+  Out[1].x = ldexp(In[1].x, In[1].y);
+  Out[1].yzw = ldexp(In[1].yzw, In[0].yzw);
+  Out[2].xy = ldexp(In[0].xy, In[1].zw);
+  Out[2].zw = ldexp(In[2].xy, In[2].zw);
+}
+
+//--- pipeline.yaml
+
+---
+Shaders:
+  - Stage: Compute
+    Entry: main
+    DispatchSize: [1, 1, 1]
+Buffers:
+  - Name: In
+    Format: Float32
+    Stride: 16
+    Data: [ 3.14159, 0, -inf, NaN, -0, 1, -0.5, inf, 1, 1, 128, -150 ]
+  - Name: Out
+    Format: Float32
+    Stride: 16
+    ZeroInitSize: 48
+  - Name: ExpectedOut # The result we expect
+    Format: Float32
+    Stride: 16
+    Data: [ 3.14159, 0, -inf, NaN, -0, 1, -0, NaN, 2.2214396, NaN, inf, 0 ]
+Results:
+  - Result: Test1
+    Rule: BufferFuzzy
+    ULPT: 1
+    Actual: Out
+    Expected: ExpectedOut
+DescriptorSets:
+  - Resources:
+    - Name: In
+      Kind: StructuredBuffer
+      DirectXBinding:
+        Register: 0
+        Space: 0
+      VulkanBinding:
+        Binding: 0
+    - Name: Out
+      Kind: RWStructuredBuffer
+      DirectXBinding:
+        Register: 1
+        Space: 0
+      VulkanBinding:
+        Binding: 1
+...
+#--- end
+
+# UNSUPPORTED: Clang-Vulkan
+# RUN: split-file %s %t
+# RUN: %dxc_target -T cs_6_5 -Fo %t.o %t/source.hlsl
+# RUN: %offloader %t/pipeline.yaml %t.o