[PATCH] D132612: [HLSL] add asin library function

[Joshua Batista via Phabricator via cfe-commits]

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This change exposes the asin library function for HLSL scalar types, 
excluding long long doubles. Asin is supported for all scalar, vector,
and matrix types. This patch only adds a subset of scalar type support.

Long long double support is missing in this patch because that type
doesn't exist in HLSL.

The full documentation of the HLSL asin function is available here:
https://docs.microsoft.com/en-us/windows/win32/direct3dhlsl/dx-graphics-hlsl-asin


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132612

Files:
  clang/lib/Headers/hlsl/hlsl_intrinsics.h
  clang/test/CodeGenHLSL/builtins/asin.hlsl


Index: clang/test/CodeGenHLSL/builtins/asin.hlsl
===================================================================
--- /dev/null
+++ clang/test/CodeGenHLSL/builtins/asin.hlsl
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -emit-llvm -disable-llvm-passes \
+// RUN:   -o - | FileCheck %s
+
+double asin_d(double x)
+{
+  return asin(x);
+}
+
+// CHECK: define noundef double @"?asin_d@@YANN at Z"(
+// CHECK: call noundef double @asin(double noundef %0) #2
+
+float asin_f(float x)
+{
+  return asin(x);
+}
+
+// CHECK: define noundef float @"?asin_f@@YAMM at Z"(
+// CHECK: call noundef float @asinf(float noundef %0)
Index: clang/lib/Headers/hlsl/hlsl_intrinsics.h
===================================================================
--- clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -12,4 +12,9 @@
 __attribute__((clang_builtin_alias(__builtin_hlsl_wave_active_count_bits))) uint
 WaveActiveCountBits(bool bBit);
 
+
+__attribute__((clang_builtin_alias(__builtin_asin))) double asin(double In);
+__attribute__((clang_builtin_alias(__builtin_asinf))) float asin(float In);
+
+
 #endif //_HLSL_HLSL_INTRINSICS_H_


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