00ecacca7d
In HLSL buffer types support array subscripting syntax for loads and stores. This change fleshes out the subscript operators to become array accesses on the underlying handle pointer. This will allow LLVM optimization passes to optimize resource accesses the same way any other memory access would be optimized. Reviewed By: aaron.ballman Differential Revision: https://reviews.llvm.org/D131268
31 lines
1.3 KiB
HLSL
31 lines
1.3 KiB
HLSL
// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -x hlsl -emit-llvm -disable-llvm-passes -o - %s | FileCheck %s
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const RWBuffer<float> In;
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RWBuffer<float> Out;
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void fn(int Idx) {
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Out[Idx] = In[Idx];
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}
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// This test is intended to verify reasonable code generation of the subscript
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// operator. In this test case we should be generating both the const and
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// non-const operators so we verify both cases.
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// Non-const comes first.
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// CHECK: ptr @"??A?$RWBuffer@M@hlsl@@QBAAAMI@Z"
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// CHECK: %this1 = load ptr, ptr %this.addr, align 4
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// CHECK-NEXT: %h = getelementptr inbounds %"class.hlsl::RWBuffer", ptr %this1, i32 0, i32 0
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// CHECK-NEXT: %0 = load ptr, ptr %h, align 4
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// CHECK-NEXT: %1 = load i32, ptr %Idx.addr, align 4
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// CHECK-NEXT: %arrayidx = getelementptr inbounds float, ptr %0, i32 %1
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// CHECK-NEXT: ret ptr %arrayidx
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// Const comes next, and returns the pointer instead of the value.
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// CHECK: ptr @"??A?$RWBuffer@M@hlsl@@QAAAAMI@Z"
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// CHECK: %this1 = load ptr, ptr %this.addr, align 4
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// CHECK-NEXT: %h = getelementptr inbounds %"class.hlsl::RWBuffer", ptr %this1, i32 0, i32 0
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// CHECK-NEXT: %0 = load ptr, ptr %h, align 4
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// CHECK-NEXT: %1 = load i32, ptr %Idx.addr, align 4
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// CHECK-NEXT: %arrayidx = getelementptr inbounds float, ptr %0, i32 %1
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// CHECK-NEXT: ret ptr %arrayidx
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