[SYCL][ESIMD] Add support for __esimd_svm_block_ld intrinsic (#4825)

* [SYCL][ESIMD] Add support for __esimd_svm_block_ld intrinsic

Signed-off-by: Sergey Dmitriev <serguei.n.dmitriev@intel.com>

* Applied suggestions from code review.

Author: sndmitriev

llvm/lib/SYCLLowerIR/LowerESIMD.cpp

@@ -293,6 +293,7 @@ class ESIMDIntrinDescTable {
         {"vstore", {"vstore", {a(1), a(0)}}},
 
         {"svm_block_ld_unaligned", {"svm.block.ld.unaligned", {l(0)}}},
+        {"svm_block_ld", {"svm.block.ld", {l(0)}}},
         {"svm_block_st", {"svm.block.st", {l(1)}}},
         {"svm_gather", {"svm.gather", {ai1(2), a(1), a(0), u(-1)}}},
         {"svm_gather4_scaled",

sycl/include/sycl/ext/intel/experimental/esimd/detail/memory_intrin.hpp

@@ -162,6 +162,24 @@ __esimd_svm_block_ld_unaligned(uint64_t addr)
 }
 #endif // __SYCL_DEVICE_ONLY__
 
+// Read a block of data from the given address. Address must be 16-byte aligned.
+template <typename Ty, int N>
+__ESIMD_INTRIN __SEIEED::vector_type_t<Ty, N>
+__esimd_svm_block_ld(uint64_t addr)
+#ifdef __SYCL_DEVICE_ONLY__
+    ;
+#else
+{
+  __SEIEED::vector_type_t<Ty, N> V;
+
+  for (int I = 0; I < N; I++) {
+    Ty *Addr = reinterpret_cast<Ty *>(addr + I * sizeof(Ty));
+    V[I] = *Addr;
+  }
+  return V;
+}
+#endif // __SYCL_DEVICE_ONLY__
+
 // flat_block_write writes a block of data using one flat address
 template <typename Ty, int N, __SEIEE::CacheHint L1H = __SEIEE::CacheHint::None,
           __SEIEE::CacheHint L3H = __SEIEE::CacheHint::None>

sycl/test/esimd/intrins_trans.cpp

@@ -214,13 +214,15 @@ test_mem_intrins(uint64_t addr, const vec<float, 8> &xf,
     // CHECK-LABEL: call void @llvm.genx.oword.st.v8f32(i32 0, i32 0, <8 x float> %{{[a-zA-Z0-9.]+}})
   }
   {
-      // TODO
-      // vec<int, 8> x = __esimd_svm_block_ld<int, 8>(addr);
-  } {
     vec<int, 8> x = __esimd_svm_block_ld_unaligned<int, 8>(addr);
     // CHECK-LABEL: %{{[a-zA-Z0-9.]+}} = call <8 x i32> @llvm.genx.svm.block.ld.unaligned.v8i32.i64(i64 %{{[a-zA-Z0-9.]+}})
     use(x);
   }
+  {
+    vec<int, 8> x = __esimd_svm_block_ld<int, 8>(addr);
+    // CHECK-LABEL: %{{[a-zA-Z0-9.]+}} = call <8 x i32> @llvm.genx.svm.block.ld.v8i32.i64(i64 %{{[a-zA-Z0-9.]+}})
+    use(x);
+  }
   {
     __esimd_svm_block_st<int, 8>(addr, get8i());
     // CHECK-LABEL: call void @llvm.genx.svm.block.st.i64.v8i32(i64 %{{[a-zA-Z0-9.]+}}, <8 x i32> %{{[a-zA-Z0-9.]+}})