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1ed64614d6
Summary: NVPTXGenericToNVVM was using target-specific intrinsics to do address space casts. Using the addrspacecast instruction is (a lot) simpler. But it also has the advantage of being understandable to other passes. In particular, InferAddrSpaces is able to understand these address space casts and remove them in most cases. Reviewers: tra Subscribers: jholewinski, sanjoy, hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D43914 llvm-svn: 326389
181 lines
6.5 KiB
LLVM
181 lines
6.5 KiB
LLVM
; RUN: llc < %s -march=nvptx -mcpu=sm_20 | FileCheck %s --check-prefix PTX
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; RUN: llc < %s -march=nvptx64 -mcpu=sm_20 | FileCheck %s --check-prefix PTX
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; RUN: opt -mtriple=nvptx-- < %s -S -infer-address-spaces | FileCheck %s --check-prefix IR
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; RUN: opt -mtriple=nvptx64-- < %s -S -infer-address-spaces | FileCheck %s --check-prefix IR
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@array = internal addrspace(3) global [10 x float] zeroinitializer, align 4
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@scalar = internal addrspace(3) global float 0.000000e+00, align 4
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; Verifies nvptx-favor-non-generic correctly optimizes generic address space
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; usage to non-generic address space usage for the patterns we claim to handle:
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; 1. load cast
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; 2. store cast
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; 3. load gep cast
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; 4. store gep cast
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; gep and cast can be an instruction or a constant expression. This function
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; tries all possible combinations.
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define void @ld_st_shared_f32(i32 %i, float %v) {
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; IR-LABEL: @ld_st_shared_f32
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; IR-NOT: addrspacecast
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; PTX-LABEL: ld_st_shared_f32(
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; load cast
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%1 = load float, float* addrspacecast (float addrspace(3)* @scalar to float*), align 4
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call void @use(float %1)
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; PTX: ld.shared.f32 %f{{[0-9]+}}, [scalar];
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; store cast
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store float %v, float* addrspacecast (float addrspace(3)* @scalar to float*), align 4
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; PTX: st.shared.f32 [scalar], %f{{[0-9]+}};
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; use syncthreads to disable optimizations across components
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call void @llvm.nvvm.barrier0()
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; PTX: bar.sync 0;
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; cast; load
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%2 = addrspacecast float addrspace(3)* @scalar to float*
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%3 = load float, float* %2, align 4
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call void @use(float %3)
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; PTX: ld.shared.f32 %f{{[0-9]+}}, [scalar];
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; cast; store
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store float %v, float* %2, align 4
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; PTX: st.shared.f32 [scalar], %f{{[0-9]+}};
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call void @llvm.nvvm.barrier0()
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; PTX: bar.sync 0;
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; load gep cast
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%4 = load float, float* getelementptr inbounds ([10 x float], [10 x float]* addrspacecast ([10 x float] addrspace(3)* @array to [10 x float]*), i32 0, i32 5), align 4
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call void @use(float %4)
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; PTX: ld.shared.f32 %f{{[0-9]+}}, [array+20];
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; store gep cast
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store float %v, float* getelementptr inbounds ([10 x float], [10 x float]* addrspacecast ([10 x float] addrspace(3)* @array to [10 x float]*), i32 0, i32 5), align 4
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; PTX: st.shared.f32 [array+20], %f{{[0-9]+}};
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call void @llvm.nvvm.barrier0()
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; PTX: bar.sync 0;
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; gep cast; load
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%5 = getelementptr inbounds [10 x float], [10 x float]* addrspacecast ([10 x float] addrspace(3)* @array to [10 x float]*), i32 0, i32 5
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%6 = load float, float* %5, align 4
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call void @use(float %6)
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; PTX: ld.shared.f32 %f{{[0-9]+}}, [array+20];
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; gep cast; store
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store float %v, float* %5, align 4
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; PTX: st.shared.f32 [array+20], %f{{[0-9]+}};
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call void @llvm.nvvm.barrier0()
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; PTX: bar.sync 0;
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; cast; gep; load
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%7 = addrspacecast [10 x float] addrspace(3)* @array to [10 x float]*
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%8 = getelementptr inbounds [10 x float], [10 x float]* %7, i32 0, i32 %i
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%9 = load float, float* %8, align 4
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call void @use(float %9)
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; PTX: ld.shared.f32 %f{{[0-9]+}}, [%{{(r|rl|rd)[0-9]+}}];
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; cast; gep; store
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store float %v, float* %8, align 4
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; PTX: st.shared.f32 [%{{(r|rl|rd)[0-9]+}}], %f{{[0-9]+}};
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call void @llvm.nvvm.barrier0()
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; PTX: bar.sync 0;
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ret void
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}
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; When hoisting an addrspacecast between different pointer types, replace the
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; addrspacecast with a bitcast.
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define i32 @ld_int_from_float() {
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; IR-LABEL: @ld_int_from_float
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; IR: load i32, i32 addrspace(3)* bitcast (float addrspace(3)* @scalar to i32 addrspace(3)*)
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; PTX-LABEL: ld_int_from_float(
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; PTX: ld.shared.u{{(32|64)}}
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%1 = load i32, i32* addrspacecast(float addrspace(3)* @scalar to i32*), align 4
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ret i32 %1
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}
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define i32 @ld_int_from_global_float(float addrspace(1)* %input, i32 %i, i32 %j) {
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; IR-LABEL: @ld_int_from_global_float(
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; PTX-LABEL: ld_int_from_global_float(
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%1 = addrspacecast float addrspace(1)* %input to float*
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%2 = getelementptr float, float* %1, i32 %i
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; IR-NEXT: getelementptr float, float addrspace(1)* %input, i32 %i
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%3 = getelementptr float, float* %2, i32 %j
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; IR-NEXT: getelementptr float, float addrspace(1)* {{%[^,]+}}, i32 %j
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%4 = bitcast float* %3 to i32*
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; IR-NEXT: bitcast float addrspace(1)* {{%[^ ]+}} to i32 addrspace(1)*
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%5 = load i32, i32* %4
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; IR-NEXT: load i32, i32 addrspace(1)* {{%.+}}
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; PTX-LABEL: ld.global
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ret i32 %5
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}
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define void @nested_const_expr() {
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; PTX-LABEL: nested_const_expr(
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; store 1 to bitcast(gep(addrspacecast(array), 0, 1))
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store i32 1, i32* bitcast (float* getelementptr ([10 x float], [10 x float]* addrspacecast ([10 x float] addrspace(3)* @array to [10 x float]*), i64 0, i64 1) to i32*), align 4
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; PTX: mov.u32 %r1, 1;
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; PTX-NEXT: st.shared.u32 [array+4], %r1;
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ret void
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}
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define void @rauw(float addrspace(1)* %input) {
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%generic_input = addrspacecast float addrspace(1)* %input to float*
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%addr = getelementptr float, float* %generic_input, i64 10
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%v = load float, float* %addr
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store float %v, float* %addr
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ret void
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; IR-LABEL: @rauw(
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; IR-NEXT: %addr = getelementptr float, float addrspace(1)* %input, i64 10
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; IR-NEXT: %v = load float, float addrspace(1)* %addr
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; IR-NEXT: store float %v, float addrspace(1)* %addr
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; IR-NEXT: ret void
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}
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define void @loop() {
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; IR-LABEL: @loop(
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entry:
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%p = addrspacecast [10 x float] addrspace(3)* @array to float*
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%end = getelementptr float, float* %p, i64 10
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br label %loop
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loop:
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%i = phi float* [ %p, %entry ], [ %i2, %loop ]
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; IR: phi float addrspace(3)* [ %p, %entry ], [ %i2, %loop ]
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%v = load float, float* %i
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; IR: %v = load float, float addrspace(3)* %i
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call void @use(float %v)
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%i2 = getelementptr float, float* %i, i64 1
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; IR: %i2 = getelementptr float, float addrspace(3)* %i, i64 1
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%exit_cond = icmp eq float* %i2, %end
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br i1 %exit_cond, label %exit, label %loop
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exit:
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ret void
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}
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@generic_end = external global float*
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define void @loop_with_generic_bound() {
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; IR-LABEL: @loop_with_generic_bound(
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entry:
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%p = addrspacecast [10 x float] addrspace(3)* @array to float*
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%end = load float*, float** @generic_end
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br label %loop
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loop:
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%i = phi float* [ %p, %entry ], [ %i2, %loop ]
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; IR: phi float addrspace(3)* [ %p, %entry ], [ %i2, %loop ]
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%v = load float, float* %i
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; IR: %v = load float, float addrspace(3)* %i
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call void @use(float %v)
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%i2 = getelementptr float, float* %i, i64 1
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; IR: %i2 = getelementptr float, float addrspace(3)* %i, i64 1
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%exit_cond = icmp eq float* %i2, %end
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; IR: addrspacecast float addrspace(3)* %i2 to float*
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; IR: icmp eq float* %{{[0-9]+}}, %end
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br i1 %exit_cond, label %exit, label %loop
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exit:
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ret void
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}
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declare void @llvm.nvvm.barrier0() #3
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declare void @use(float)
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attributes #3 = { noduplicate nounwind }
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