a0d699a8e6
This helps to disambiguate accesses in the caller and the callee after LLVM inlining in some apps. I did not see any performance changes, but this is one step towards enabling other optimizations in the apps that I am looking at. The definition of llvm.noalias says: ``` ... indicates that memory locations accessed via pointer values based on the argument or return value are not also accessed, during the execution of the function, via pointer values not based on the argument or return value. This guarantee only holds for memory locations that are modified, by any means, during the execution of the function. ``` I believe this exactly matches Fortran rules for the dummy arguments that are modified during their subprogram execution. I also set llvm.noalias and llvm.nocapture on the !fir.box<> arguments, because the corresponding descriptors cannot be captured and cannot alias anything (not based on them) during the execution of the subprogram.
114 lines
4.0 KiB
Plaintext
114 lines
4.0 KiB
Plaintext
// RUN: fir-opt --function-attr="set-noalias=true" %s | FileCheck %s
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// Test the annotation of function arguments with llvm.noalias.
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// Test !fir.ref arguments.
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// CHECK-LABEL: func.func private @test_ref(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.ref<i32> {llvm.noalias}) {
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func.func private @test_ref(%arg0: !fir.ref<i32>) {
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return
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}
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// CHECK-LABEL: func.func private @test_ref_target(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.ref<i32> {fir.target}) {
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func.func private @test_ref_target(%arg0: !fir.ref<i32> {fir.target}) {
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return
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}
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// CHECK-LABEL: func.func private @test_ref_volatile(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.ref<i32> {fir.volatile}) {
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func.func private @test_ref_volatile(%arg0: !fir.ref<i32> {fir.volatile}) {
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return
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}
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// CHECK-LABEL: func.func private @test_ref_asynchronous(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.ref<i32> {fir.asynchronous}) {
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func.func private @test_ref_asynchronous(%arg0: !fir.ref<i32> {fir.asynchronous}) {
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return
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}
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// CHECK-LABEL: func.func private @test_ref_box(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.ref<!fir.box<i32>> {llvm.noalias}) {
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// Test !fir.ref<!fir.box<>> arguments:
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func.func private @test_ref_box(%arg0: !fir.ref<!fir.box<i32>>) {
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return
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}
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// CHECK-LABEL: func.func private @test_ref_box_target(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.ref<!fir.box<i32>> {fir.target}) {
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func.func private @test_ref_box_target(%arg0: !fir.ref<!fir.box<i32>> {fir.target}) {
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return
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}
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// CHECK-LABEL: func.func private @test_ref_box_volatile(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.ref<!fir.box<i32>> {fir.volatile}) {
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func.func private @test_ref_box_volatile(%arg0: !fir.ref<!fir.box<i32>> {fir.volatile}) {
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return
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}
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// CHECK-LABEL: func.func private @test_ref_box_asynchronous(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.ref<!fir.box<i32>> {fir.asynchronous}) {
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func.func private @test_ref_box_asynchronous(%arg0: !fir.ref<!fir.box<i32>> {fir.asynchronous}) {
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return
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}
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// Test POINTER arguments.
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// CHECK-LABEL: func.func private @test_ref_box_ptr(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.ref<!fir.box<!fir.ptr<i32>>>) {
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func.func private @test_ref_box_ptr(%arg0: !fir.ref<!fir.box<!fir.ptr<i32>>>) {
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return
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}
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// Test ALLOCATABLE arguments.
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// CHECK-LABEL: func.func private @test_ref_box_heap(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.ref<!fir.box<!fir.heap<i32>>> {llvm.noalias}) {
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func.func private @test_ref_box_heap(%arg0: !fir.ref<!fir.box<!fir.heap<i32>>>) {
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return
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}
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// BIND(C) functions are not annotated.
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// CHECK-LABEL: func.func private @test_ref_bindc(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.ref<i32>)
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func.func private @test_ref_bindc(%arg0: !fir.ref<i32>) attributes {fir.bindc_name = "test_ref_bindc", fir.proc_attrs = #fir.proc_attrs<bind_c>} {
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return
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}
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// Test function declaration from a module.
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// CHECK-LABEL: func.func private @_QMtest_modPcheck_module(
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// CHECK-SAME: !fir.ref<i32> {llvm.noalias})
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func.func private @_QMtest_modPcheck_module(!fir.ref<i32>)
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// Test !fir.box arguments:
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// CHECK-LABEL: func.func private @test_box(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.box<i32> {llvm.noalias}) {
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func.func private @test_box(%arg0: !fir.box<i32>) {
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return
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}
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// CHECK-LABEL: func.func private @test_box_target(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.box<i32> {fir.target, llvm.noalias}) {
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func.func private @test_box_target(%arg0: !fir.box<i32> {fir.target}) {
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return
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}
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// CHECK-LABEL: func.func private @test_box_volatile(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.box<i32> {fir.volatile, llvm.noalias}) {
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func.func private @test_box_volatile(%arg0: !fir.box<i32> {fir.volatile}) {
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return
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}
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// CHECK-LABEL: func.func private @test_box_asynchronous(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.box<i32> {fir.asynchronous, llvm.noalias}) {
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func.func private @test_box_asynchronous(%arg0: !fir.box<i32> {fir.asynchronous}) {
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return
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}
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// !fir.boxchar<> is lowered before FunctionAttrPass, but let's
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// make sure we do not annotate it.
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// CHECK-LABEL: func.func private @test_boxchar(
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// CHECK-SAME: %[[ARG0:.*]]: !fir.boxchar<1>) {
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func.func private @test_boxchar(%arg0: !fir.boxchar<1>) {
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return
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}
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