loop.mlir
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// RUN: mlir-translate -split-input-file -test-spirv-roundtrip %s | FileCheck %s
// Single loop
spv.module "Logical" "GLSL450" {
// for (int i = 0; i < count; ++i) {}
func @loop(%count : i32) -> () {
%zero = spv.constant 0: i32
%one = spv.constant 1: i32
%var = spv.Variable init(%zero) : !spv.ptr<i32, Function>
// CHECK: spv.Branch ^bb1
// CHECK-NEXT: ^bb1:
// CHECK-NEXT: spv.loop
spv.loop {
// CHECK-NEXT: spv.Branch ^bb1
spv.Branch ^header
// CHECK-NEXT: ^bb1:
^header:
// CHECK-NEXT: spv.Load
%val0 = spv.Load "Function" %var : i32
// CHECK-NEXT: spv.SLessThan
%cmp = spv.SLessThan %val0, %count : i32
// CHECK-NEXT: spv.BranchConditional %{{.*}} [1, 1], ^bb2, ^bb4
spv.BranchConditional %cmp [1, 1], ^body, ^merge
// CHECK-NEXT: ^bb2:
^body:
// Do nothing
// CHECK-NEXT: spv.Branch ^bb3
spv.Branch ^continue
// CHECK-NEXT: ^bb3:
^continue:
// CHECK-NEXT: spv.Load
%val1 = spv.Load "Function" %var : i32
// CHECK-NEXT: spv.constant 1
// CHECK-NEXT: spv.IAdd
%add = spv.IAdd %val1, %one : i32
// CHECK-NEXT: spv.Store
spv.Store "Function" %var, %add : i32
// CHECK-NEXT: spv.Branch ^bb1
spv.Branch ^header
// CHECK-NEXT: ^bb4:
// CHECK-NEXT: spv._merge
^merge:
spv._merge
}
spv.Return
}
func @main() -> () {
spv.Return
}
spv.EntryPoint "GLCompute" @main
} attributes {
capabilities = ["Shader"]
}
// -----
spv.module "Logical" "GLSL450" {
spv.globalVariable @GV1 bind(0, 0) : !spv.ptr<!spv.struct<!spv.array<10 x f32 [4]> [0]>, StorageBuffer>
spv.globalVariable @GV2 bind(0, 1) : !spv.ptr<!spv.struct<!spv.array<10 x f32 [4]> [0]>, StorageBuffer>
func @loop_kernel() {
%0 = spv._address_of @GV1 : !spv.ptr<!spv.struct<!spv.array<10 x f32 [4]> [0]>, StorageBuffer>
%1 = spv.constant 0 : i32
%2 = spv.AccessChain %0[%1] : !spv.ptr<!spv.struct<!spv.array<10 x f32 [4]> [0]>, StorageBuffer>
%3 = spv._address_of @GV2 : !spv.ptr<!spv.struct<!spv.array<10 x f32 [4]> [0]>, StorageBuffer>
%5 = spv.AccessChain %3[%1] : !spv.ptr<!spv.struct<!spv.array<10 x f32 [4]> [0]>, StorageBuffer>
%6 = spv.constant 4 : i32
%7 = spv.constant 42 : i32
%8 = spv.constant 2 : i32
// CHECK: spv.Branch ^bb1(%{{.*}} : i32)
// CHECK-NEXT: ^bb1(%[[OUTARG:.*]]: i32):
// CHECK-NEXT: spv.loop {
spv.loop {
// CHECK-NEXT: spv.Branch ^bb1(%[[OUTARG]] : i32)
spv.Branch ^header(%6 : i32)
// CHECK-NEXT: ^bb1(%[[HEADARG:.*]]: i32):
^header(%9: i32):
%10 = spv.SLessThan %9, %7 : i32
// CHECK: spv.BranchConditional %{{.*}}, ^bb2, ^bb3
spv.BranchConditional %10, ^body, ^merge
// CHECK-NEXT: ^bb2: // pred: ^bb1
^body:
%11 = spv.AccessChain %2[%9] : !spv.ptr<!spv.array<10 x f32 [4]>, StorageBuffer>
%12 = spv.Load "StorageBuffer" %11 : f32
%13 = spv.AccessChain %5[%9] : !spv.ptr<!spv.array<10 x f32 [4]>, StorageBuffer>
spv.Store "StorageBuffer" %13, %12 : f32
// CHECK: %[[ADD:.*]] = spv.IAdd
%14 = spv.IAdd %9, %8 : i32
// CHECK-NEXT: spv.Branch ^bb1(%[[ADD]] : i32)
spv.Branch ^header(%14 : i32)
// CHECK-NEXT: ^bb3:
^merge:
// CHECK-NEXT: spv._merge
spv._merge
}
spv.Return
}
spv.EntryPoint "GLCompute" @loop_kernel
spv.ExecutionMode @loop_kernel "LocalSize", 1, 1, 1
} attributes {capabilities = ["Shader"], extensions = ["SPV_KHR_storage_buffer_storage_class"]}
// -----
// Nested loop
spv.module "Logical" "GLSL450" {
// for (int i = 0; i < count; ++i) {
// for (int j = 0; j < count; ++j) { }
// }
func @loop(%count : i32) -> () {
%zero = spv.constant 0: i32
%one = spv.constant 1: i32
%ivar = spv.Variable init(%zero) : !spv.ptr<i32, Function>
%jvar = spv.Variable init(%zero) : !spv.ptr<i32, Function>
// CHECK: spv.Branch ^bb1
// CHECK-NEXT: ^bb1:
// CHECK-NEXT: spv.loop
spv.loop {
// CHECK-NEXT: spv.Branch ^bb1
spv.Branch ^header
// CHECK-NEXT: ^bb1:
^header:
// CHECK-NEXT: spv.Load
%ival0 = spv.Load "Function" %ivar : i32
// CHECK-NEXT: spv.SLessThan
%icmp = spv.SLessThan %ival0, %count : i32
// CHECK-NEXT: spv.BranchConditional %{{.*}}, ^bb2, ^bb5
spv.BranchConditional %icmp, ^body, ^merge
// CHECK-NEXT: ^bb2:
^body:
// CHECK-NEXT: spv.constant 0
// CHECK-NEXT: spv.Store
spv.Store "Function" %jvar, %zero : i32
// CHECK-NEXT: spv.Branch ^bb3
// CHECK-NEXT: ^bb3:
// CHECK-NEXT: spv.loop
spv.loop {
// CHECK-NEXT: spv.Branch ^bb1
spv.Branch ^header
// CHECK-NEXT: ^bb1:
^header:
// CHECK-NEXT: spv.Load
%jval0 = spv.Load "Function" %jvar : i32
// CHECK-NEXT: spv.SLessThan
%jcmp = spv.SLessThan %jval0, %count : i32
// CHECK-NEXT: spv.BranchConditional %{{.*}}, ^bb2, ^bb4
spv.BranchConditional %jcmp, ^body, ^merge
// CHECK-NEXT: ^bb2:
^body:
// Do nothing
// CHECK-NEXT: spv.Branch ^bb3
spv.Branch ^continue
// CHECK-NEXT: ^bb3:
^continue:
// CHECK-NEXT: spv.Load
%jval1 = spv.Load "Function" %jvar : i32
// CHECK-NEXT: spv.constant 1
// CHECK-NEXT: spv.IAdd
%add = spv.IAdd %jval1, %one : i32
// CHECK-NEXT: spv.Store
spv.Store "Function" %jvar, %add : i32
// CHECK-NEXT: spv.Branch ^bb1
spv.Branch ^header
// CHECK-NEXT: ^bb4:
^merge:
// CHECK-NEXT: spv._merge
spv._merge
} // end inner loop
// CHECK: spv.Branch ^bb4
spv.Branch ^continue
// CHECK-NEXT: ^bb4:
^continue:
// CHECK-NEXT: spv.Load
%ival1 = spv.Load "Function" %ivar : i32
// CHECK-NEXT: spv.constant 1
// CHECK-NEXT: spv.IAdd
%add = spv.IAdd %ival1, %one : i32
// CHECK-NEXT: spv.Store
spv.Store "Function" %ivar, %add : i32
// CHECK-NEXT: spv.Branch ^bb1
spv.Branch ^header
// CHECK-NEXT: ^bb5:
// CHECK-NEXT: spv._merge
^merge:
spv._merge
} // end outer loop
spv.Return
}
func @main() -> () {
spv.Return
}
spv.EntryPoint "GLCompute" @main
} attributes {
capabilities = ["Shader"]
}