forked from OSchip/llvm-project
142 lines
6.4 KiB
LLVM
142 lines
6.4 KiB
LLVM
; RUN: llc < %s -march=nvptx64 -mcpu=sm_20 | FileCheck %s --check-prefix=PTX
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; RUN: opt < %s -S -separate-const-offset-from-gep -gvn -dce | FileCheck %s --check-prefix=IR
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; Verifies the SeparateConstOffsetFromGEP pass.
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; The following code computes
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; *output = array[x][y] + array[x][y+1] + array[x+1][y] + array[x+1][y+1]
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;
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; We expect SeparateConstOffsetFromGEP to transform it to
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;
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; float *base = &a[x][y];
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; *output = base[0] + base[1] + base[32] + base[33];
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;
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; so the backend can emit PTX that uses fewer virtual registers.
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target datalayout = "e-i64:64-v16:16-v32:32-n16:32:64"
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target triple = "nvptx64-unknown-unknown"
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@array = internal addrspace(3) constant [32 x [32 x float]] zeroinitializer, align 4
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define void @sum_of_array(i32 %x, i32 %y, float* nocapture %output) {
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.preheader:
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%0 = sext i32 %y to i64
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%1 = sext i32 %x to i64
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%2 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %1, i64 %0
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%3 = addrspacecast float addrspace(3)* %2 to float*
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%4 = load float* %3, align 4
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%5 = fadd float %4, 0.000000e+00
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%6 = add i32 %y, 1
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%7 = sext i32 %6 to i64
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%8 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %1, i64 %7
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%9 = addrspacecast float addrspace(3)* %8 to float*
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%10 = load float* %9, align 4
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%11 = fadd float %5, %10
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%12 = add i32 %x, 1
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%13 = sext i32 %12 to i64
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%14 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %13, i64 %0
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%15 = addrspacecast float addrspace(3)* %14 to float*
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%16 = load float* %15, align 4
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%17 = fadd float %11, %16
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%18 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %13, i64 %7
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%19 = addrspacecast float addrspace(3)* %18 to float*
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%20 = load float* %19, align 4
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%21 = fadd float %17, %20
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store float %21, float* %output, align 4
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ret void
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}
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; PTX-LABEL: sum_of_array(
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; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG:%(rl|r)[0-9]+]]{{\]}}
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; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG]]+4{{\]}}
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; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG]]+128{{\]}}
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; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG]]+132{{\]}}
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; IR-LABEL: @sum_of_array(
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; IR: [[BASE_PTR:%[a-zA-Z0-9]+]] = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %{{[a-zA-Z0-9]+}}, i64 %{{[a-zA-Z0-9]+}}
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; IR: getelementptr float addrspace(3)* [[BASE_PTR]], i64 1
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; IR: getelementptr float addrspace(3)* [[BASE_PTR]], i64 32
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; IR: getelementptr float addrspace(3)* [[BASE_PTR]], i64 33
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; @sum_of_array2 is very similar to @sum_of_array. The only difference is in
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; the order of "sext" and "add" when computing the array indices. @sum_of_array
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; computes add before sext, e.g., array[sext(x + 1)][sext(y + 1)], while
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; @sum_of_array2 computes sext before add,
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; e.g., array[sext(x) + 1][sext(y) + 1]. SeparateConstOffsetFromGEP should be
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; able to extract constant offsets from both forms.
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define void @sum_of_array2(i32 %x, i32 %y, float* nocapture %output) {
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.preheader:
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%0 = sext i32 %y to i64
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%1 = sext i32 %x to i64
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%2 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %1, i64 %0
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%3 = addrspacecast float addrspace(3)* %2 to float*
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%4 = load float* %3, align 4
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%5 = fadd float %4, 0.000000e+00
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%6 = add i64 %0, 1
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%7 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %1, i64 %6
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%8 = addrspacecast float addrspace(3)* %7 to float*
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%9 = load float* %8, align 4
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%10 = fadd float %5, %9
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%11 = add i64 %1, 1
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%12 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %11, i64 %0
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%13 = addrspacecast float addrspace(3)* %12 to float*
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%14 = load float* %13, align 4
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%15 = fadd float %10, %14
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%16 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %11, i64 %6
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%17 = addrspacecast float addrspace(3)* %16 to float*
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%18 = load float* %17, align 4
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%19 = fadd float %15, %18
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store float %19, float* %output, align 4
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ret void
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}
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; PTX-LABEL: sum_of_array2(
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; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG:%(rl|r)[0-9]+]]{{\]}}
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; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG]]+4{{\]}}
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; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG]]+128{{\]}}
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; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG]]+132{{\]}}
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; IR-LABEL: @sum_of_array2(
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; IR: [[BASE_PTR:%[a-zA-Z0-9]+]] = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %{{[a-zA-Z0-9]+}}, i64 %{{[a-zA-Z0-9]+}}
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; IR: getelementptr float addrspace(3)* [[BASE_PTR]], i64 1
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; IR: getelementptr float addrspace(3)* [[BASE_PTR]], i64 32
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; IR: getelementptr float addrspace(3)* [[BASE_PTR]], i64 33
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; Similar to @sum_of_array3, but extends array indices using zext instead of
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; sext. e.g., array[zext(x + 1)][zext(y + 1)].
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define void @sum_of_array3(i32 %x, i32 %y, float* nocapture %output) {
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.preheader:
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%0 = zext i32 %y to i64
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%1 = zext i32 %x to i64
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%2 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %1, i64 %0
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%3 = addrspacecast float addrspace(3)* %2 to float*
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%4 = load float* %3, align 4
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%5 = fadd float %4, 0.000000e+00
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%6 = add i32 %y, 1
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%7 = zext i32 %6 to i64
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%8 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %1, i64 %7
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%9 = addrspacecast float addrspace(3)* %8 to float*
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%10 = load float* %9, align 4
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%11 = fadd float %5, %10
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%12 = add i32 %x, 1
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%13 = zext i32 %12 to i64
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%14 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %13, i64 %0
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%15 = addrspacecast float addrspace(3)* %14 to float*
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%16 = load float* %15, align 4
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%17 = fadd float %11, %16
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%18 = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %13, i64 %7
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%19 = addrspacecast float addrspace(3)* %18 to float*
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%20 = load float* %19, align 4
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%21 = fadd float %17, %20
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store float %21, float* %output, align 4
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ret void
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}
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; PTX-LABEL: sum_of_array3(
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; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG:%(rl|r)[0-9]+]]{{\]}}
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; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG]]+4{{\]}}
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; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG]]+128{{\]}}
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; PTX: ld.shared.f32 {{%f[0-9]+}}, {{\[}}[[BASE_REG]]+132{{\]}}
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; IR-LABEL: @sum_of_array3(
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; IR: [[BASE_PTR:%[a-zA-Z0-9]+]] = getelementptr inbounds [32 x [32 x float]] addrspace(3)* @array, i64 0, i64 %{{[a-zA-Z0-9]+}}, i64 %{{[a-zA-Z0-9]+}}
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; IR: getelementptr float addrspace(3)* [[BASE_PTR]], i64 1
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; IR: getelementptr float addrspace(3)* [[BASE_PTR]], i64 32
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; IR: getelementptr float addrspace(3)* [[BASE_PTR]], i64 33
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