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[SYCL][ESIMD] Preserve undef initializer for globals in ESIMDLowerVecArg pass #2555

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Merged
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Oct 1, 2020
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[SYCL][ESIMD] Preserve undef initializer for globals in ESIMDLowerVecArg pass #2555

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af13cc6
[SYCL][ESIMD] Precommit test for ESIMDLowerVecArg pass
DenisBakhvalov Sep 28, 2020
b63292d
[SYCL][ESIMD] Preserving undef intializer for globals in ESIMDLowerVe…
DenisBakhvalov Sep 28, 2020
ee814a9
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DenisBakhvalov Sep 29, 2020
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9 changes: 6 additions & 3 deletions llvm/lib/SYCLLowerIR/LowerESIMDVecArg.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -272,10 +272,13 @@ void ESIMDLowerVecArgPass::fixGlobals(Module &M) {
if (NewTy && !G.user_empty()) {
// Peel off ptr type that getSimdArgPtrTyOrNull applies
NewTy = NewTy->getPointerElementType();
auto ZeroInit = ConstantAggregateZero::get(NewTy);
auto InitVal =
G.hasInitializer() && isa<UndefValue>(G.getInitializer())
? static_cast<ConstantData *>(UndefValue::get(NewTy))
: static_cast<ConstantData *>(ConstantAggregateZero::get(NewTy));
auto NewGlobalVar =
new GlobalVariable(NewTy, G.isConstant(), G.getLinkage(), ZeroInit,
"", G.getThreadLocalMode(), G.getAddressSpace());
new GlobalVariable(NewTy, G.isConstant(), G.getLinkage(), InitVal, "",
G.getThreadLocalMode(), G.getAddressSpace());
NewGlobalVar->setExternallyInitialized(G.isExternallyInitialized());
NewGlobalVar->copyAttributesFrom(&G);
NewGlobalVar->takeName(&G);
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22 changes: 22 additions & 0 deletions llvm/test/SYCLLowerIR/esimd_global_undef.ll
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Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -ESIMDLowerVecArg -S | FileCheck %s

; This test checks that undef initializer of a global variable is preserved
; during ESIMDLowerVecArg transformation

target datalayout = "e-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-n8:16:32:64"
target triple = "spir64-unknown-unknown-sycldevice"

%"class.cl::sycl::INTEL::gpu::simd" = type { <2512 x i32> }

; CHECK: @Global = dso_local global <2512 x i32> undef, align 16384
@Global = dso_local global %"class.cl::sycl::INTEL::gpu::simd" undef, align 16384

define void @f(<2512 x i32> %simd_val) {
; CHECK-LABEL: @f(
; CHECK-NEXT: store <2512 x i32> [[SIMD_VAL:%.*]], <2512 x i32> addrspace(4)* getelementptr (%"class.cl::sycl::INTEL::gpu::simd", %"class.cl::sycl::INTEL::gpu::simd" addrspace(4)* addrspacecast (%"class.cl::sycl::INTEL::gpu::simd"* bitcast (<2512 x i32>* @Global to %"class.cl::sycl::INTEL::gpu::simd"*) to %"class.cl::sycl::INTEL::gpu::simd" addrspace(4)*), i64 0, i32 0), align 16384
; CHECK-NEXT: ret void
;
store <2512 x i32> %simd_val, <2512 x i32> addrspace(4)* getelementptr (%"class.cl::sycl::INTEL::gpu::simd", %"class.cl::sycl::INTEL::gpu::simd" addrspace(4)* addrspacecast (%"class.cl::sycl::INTEL::gpu::simd"* @Global to %"class.cl::sycl::INTEL::gpu::simd" addrspace(4)*), i64 0, i32 0), align 16384
ret void
}