d77ae7f251
Renames the current lowering scheme to "module" and introduces two new ones, "kernel" and "table", plus a "hybrid" that chooses between those three on a per-variable basis. Unit tests are set up to pass with the default lowering of "module" or "hybrid" with this patch defaulting to "module", which will be a less dramatic codegen change relative to the current. This reflects the sparsity of test coverage for the table lowering method. Hybrid is better than module in every respect and will be default in a subsequent patch. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D139433
68 lines
3.4 KiB
LLVM
68 lines
3.4 KiB
LLVM
; RUN: opt -S -mtriple=amdgcn-- -amdgpu-lower-module-lds < %s | FileCheck %s
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; RUN: opt -S -mtriple=amdgcn-- -passes=amdgpu-lower-module-lds < %s | FileCheck %s
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; Variables that are not lowered by this pass are left unchanged
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; CHECK-NOT: asm
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; CHECK-NOT: llvm.amdgcn.module.lds
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; CHECK-NOT: llvm.amdgcn.module.lds.t
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; var1 is removed, var2 stays because it's in compiler.used
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; CHECK-NOT: @var1
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; CHECK: @var2 = addrspace(3) global float undef
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@var1 = addrspace(3) global i32 undef
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@var2 = addrspace(3) global float undef
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; constant variables are left to the optimizer / error diagnostics
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; CHECK: @const_undef = addrspace(3) constant i32 undef
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; CHECK: @const_with_init = addrspace(3) constant i64 8
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@const_undef = addrspace(3) constant i32 undef
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@const_with_init = addrspace(3) constant i64 8
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; External and constant are both left to the optimizer / error diagnostics
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; CHECK: @extern = external addrspace(3) global i32
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@extern = external addrspace(3) global i32
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; Use of an addrspace(3) variable with an initializer is skipped,
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; so as to preserve the unimplemented error from llc
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; CHECK: @with_init = addrspace(3) global i64 0
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@with_init = addrspace(3) global i64 0
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; Only local addrspace variables are transformed
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; CHECK: @addr4 = addrspace(4) global i64 undef
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@addr4 = addrspace(4) global i64 undef
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; Assign to self is treated as any other initializer, i.e. ignored by this pass
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; CHECK: @toself = addrspace(3) global float addrspace(3)* bitcast (float addrspace(3)* addrspace(3)* @toself to float addrspace(3)*), align 8
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@toself = addrspace(3) global float addrspace(3)* bitcast (float addrspace(3)* addrspace(3)* @toself to float addrspace(3)*), align 8
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; Use by .used lists doesn't trigger lowering
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; CHECK-NOT: @llvm.used =
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@llvm.used = appending global [1 x i8*] [i8* addrspacecast (i8 addrspace(3)* bitcast (i32 addrspace(3)* @var1 to i8 addrspace(3)*) to i8*)], section "llvm.metadata"
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; CHECK: @llvm.compiler.used = appending global [1 x i8*] [i8* addrspacecast (i8 addrspace(3)* bitcast (float addrspace(3)* @var2 to i8 addrspace(3)*) to i8*)], section "llvm.metadata"
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@llvm.compiler.used = appending global [1 x i8*] [i8* addrspacecast (i8 addrspace(3)* bitcast (float addrspace(3)* @var2 to i8 addrspace(3)*) to i8*)], section "llvm.metadata"
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; Access from a function would cause lowering for non-excluded cases
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; CHECK-LABEL: @use_variables()
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; CHECK: %c0 = load i32, i32 addrspace(3)* @const_undef, align 4
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; CHECK: %c1 = load i64, i64 addrspace(3)* @const_with_init, align 4
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; CHECK: %v0 = atomicrmw add i64 addrspace(3)* @with_init, i64 1 seq_cst
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; CHECK: %v1 = cmpxchg i32 addrspace(3)* @extern, i32 4, i32 %c0 acq_rel monotonic
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; CHECK: %v2 = atomicrmw add i64 addrspace(4)* @addr4, i64 %c1 monotonic
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define void @use_variables() {
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%c0 = load i32, i32 addrspace(3)* @const_undef, align 4
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%c1 = load i64, i64 addrspace(3)* @const_with_init, align 4
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%v0 = atomicrmw add i64 addrspace(3)* @with_init, i64 1 seq_cst
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%v1 = cmpxchg i32 addrspace(3)* @extern, i32 4, i32 %c0 acq_rel monotonic
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%v2 = atomicrmw add i64 addrspace(4)* @addr4, i64 %c1 monotonic
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ret void
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}
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; CHECK-LABEL: @kern_use()
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; CHECK: %inc = atomicrmw add i32 addrspace(3)* getelementptr inbounds (%llvm.amdgcn.kernel.kern_use.lds.t, %llvm.amdgcn.kernel.kern_use.lds.t addrspace(3)* @llvm.amdgcn.kernel.kern_use.lds, i32 0, i32 0), i32 1 monotonic, align 4
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define amdgpu_kernel void @kern_use() {
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%inc = atomicrmw add i32 addrspace(3)* @var1, i32 1 monotonic
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call void @use_variables()
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ret void
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}
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