188 lines
6.7 KiB
LLVM
188 lines
6.7 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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@generic_scalar = internal global float 0.000000e+00, align 4
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define float @ld_from_shared() {
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%1 = addrspacecast float* @generic_scalar to float addrspace(3)*
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%2 = load float, float addrspace(3)* %1
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ret float %2
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}
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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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