derek.holloway
7502bf64a4
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216 lines
6.3 KiB
LLVM
216 lines
6.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=mem2reg -S | FileCheck %s
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; This tests that mem2reg preserves the !nonnull metadata on loads
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; from allocas that get optimized out.
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; Check the case where the alloca in question has a single store.
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define ptr @single_store_noundef(ptr %arg) {
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; CHECK-LABEL: @single_store_noundef(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ARG_LOAD:%.*]] = load ptr, ptr [[ARG:%.*]], align 8
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; CHECK-NEXT: [[TMP0:%.*]] = icmp ne ptr [[ARG_LOAD]], null
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; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
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; CHECK-NEXT: ret ptr [[ARG_LOAD]]
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;
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entry:
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%buf = alloca ptr
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%arg.load = load ptr, ptr %arg, align 8
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store ptr %arg.load, ptr %buf, align 8
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%buf.load = load ptr, ptr %buf, !nonnull !0, !noundef !0
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ret ptr %buf.load
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}
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define ptr @single_store_missing_noundef(ptr %arg) {
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; CHECK-LABEL: @single_store_missing_noundef(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ARG_LOAD:%.*]] = load ptr, ptr [[ARG:%.*]], align 8
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; CHECK-NEXT: ret ptr [[ARG_LOAD]]
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;
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entry:
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%buf = alloca ptr
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%arg.load = load ptr, ptr %arg, align 8
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store ptr %arg.load, ptr %buf, align 8
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%buf.load = load ptr, ptr %buf, !nonnull !0
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ret ptr %buf.load
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}
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; Check the case where the alloca in question has more than one
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; store but still within one basic block.
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define ptr @single_block_noundef(ptr %arg) {
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; CHECK-LABEL: @single_block_noundef(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ARG_LOAD:%.*]] = load ptr, ptr [[ARG:%.*]], align 8
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; CHECK-NEXT: [[TMP0:%.*]] = icmp ne ptr [[ARG_LOAD]], null
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; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
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; CHECK-NEXT: ret ptr [[ARG_LOAD]]
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;
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entry:
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%buf = alloca ptr
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%arg.load = load ptr, ptr %arg, align 8
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store ptr null, ptr %buf, align 8
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store ptr %arg.load, ptr %buf, align 8
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%buf.load = load ptr, ptr %buf, !nonnull !0, !noundef !0
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ret ptr %buf.load
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}
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define ptr @single_block_missing_noundef(ptr %arg) {
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; CHECK-LABEL: @single_block_missing_noundef(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ARG_LOAD:%.*]] = load ptr, ptr [[ARG:%.*]], align 8
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; CHECK-NEXT: ret ptr [[ARG_LOAD]]
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;
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entry:
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%buf = alloca ptr
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%arg.load = load ptr, ptr %arg, align 8
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store ptr null, ptr %buf, align 8
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store ptr %arg.load, ptr %buf, align 8
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%buf.load = load ptr, ptr %buf, !nonnull !0
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ret ptr %buf.load
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}
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; Check the case where the alloca in question has more than one
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; store and also reads ands writes in multiple blocks.
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define ptr @multi_block_noundef(ptr %arg) {
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; CHECK-LABEL: @multi_block_noundef(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ARG_LOAD:%.*]] = load ptr, ptr [[ARG:%.*]], align 8
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; CHECK-NEXT: br label [[NEXT:%.*]]
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; CHECK: next:
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; CHECK-NEXT: [[TMP0:%.*]] = icmp ne ptr [[ARG_LOAD]], null
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; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
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; CHECK-NEXT: ret ptr [[ARG_LOAD]]
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;
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entry:
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%buf = alloca ptr
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%arg.load = load ptr, ptr %arg, align 8
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store ptr null, ptr %buf, align 8
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br label %next
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next:
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store ptr %arg.load, ptr %buf, align 8
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%buf.load = load ptr, ptr %buf, !nonnull !0, !noundef !0
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ret ptr %buf.load
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}
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define ptr @multi_block_missing_noundef(ptr %arg) {
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; CHECK-LABEL: @multi_block_missing_noundef(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ARG_LOAD:%.*]] = load ptr, ptr [[ARG:%.*]], align 8
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; CHECK-NEXT: br label [[NEXT:%.*]]
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; CHECK: next:
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; CHECK-NEXT: ret ptr [[ARG_LOAD]]
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;
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entry:
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%buf = alloca ptr
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%arg.load = load ptr, ptr %arg, align 8
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store ptr null, ptr %buf, align 8
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br label %next
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next:
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store ptr %arg.load, ptr %buf, align 8
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%buf.load = load ptr, ptr %buf, !nonnull !0
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ret ptr %buf.load
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}
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; Check that we don't add an assume if it's not
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; necessary i.e. the value is already implied to be nonnull
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define ptr @no_assume(ptr %arg) {
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; CHECK-LABEL: @no_assume(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ARG_LOAD:%.*]] = load ptr, ptr [[ARG:%.*]], align 8
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; CHECK-NEXT: [[CN:%.*]] = icmp ne ptr [[ARG_LOAD]], null
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; CHECK-NEXT: br i1 [[CN]], label [[NEXT:%.*]], label [[FIN:%.*]]
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; CHECK: next:
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; CHECK-NEXT: ret ptr [[ARG_LOAD]]
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; CHECK: fin:
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; CHECK-NEXT: ret ptr null
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;
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entry:
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%buf = alloca ptr
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%arg.load = load ptr, ptr %arg, align 8
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%cn = icmp ne ptr %arg.load, null
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br i1 %cn, label %next, label %fin
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next:
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; At this point the above nonnull check ensures that
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; the value %arg.load is nonnull in this block and thus
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; we need not add the assume.
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store ptr %arg.load, ptr %buf, align 8
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%buf.load = load ptr, ptr %buf, !nonnull !0
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ret ptr %buf.load
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fin:
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ret ptr null
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}
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define ptr @no_store_single_load_noundef() {
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; CHECK-LABEL: @no_store_single_load_noundef(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i1 true, ptr poison, align 1
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; CHECK-NEXT: ret ptr undef
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;
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entry:
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%buf = alloca ptr
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%buf.load = load ptr, ptr %buf, !noundef !0
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ret ptr %buf.load
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}
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define ptr @no_store_multiple_loads_noundef(i1 %c) {
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; CHECK-LABEL: @no_store_multiple_loads_noundef(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
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; CHECK: if:
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; CHECK-NEXT: store i1 true, ptr poison, align 1
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; CHECK-NEXT: ret ptr undef
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; CHECK: else:
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; CHECK-NEXT: store i1 true, ptr poison, align 1
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; CHECK-NEXT: ret ptr undef
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;
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entry:
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%buf = alloca ptr
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br i1 %c, label %if, label %else
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if:
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%buf.load = load ptr, ptr %buf, !noundef !0
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ret ptr %buf.load
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else:
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%buf.load2 = load ptr, ptr %buf, !noundef !0
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ret ptr %buf.load2
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}
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define ptr @no_store_single_load_nonnull_noundef() {
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; CHECK-LABEL: @no_store_single_load_nonnull_noundef(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i1 true, ptr poison, align 1
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; CHECK-NEXT: ret ptr undef
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;
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entry:
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%buf = alloca ptr
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%buf.load = load ptr, ptr %buf, !nonnull !0, !noundef !0
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ret ptr %buf.load
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}
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define ptr @no_store_multiple_loads_nonnull_noundef(i1 %c) {
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; CHECK-LABEL: @no_store_multiple_loads_nonnull_noundef(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
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; CHECK: if:
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; CHECK-NEXT: store i1 true, ptr poison, align 1
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; CHECK-NEXT: ret ptr undef
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; CHECK: else:
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; CHECK-NEXT: store i1 true, ptr poison, align 1
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; CHECK-NEXT: ret ptr undef
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;
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entry:
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%buf = alloca ptr
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br i1 %c, label %if, label %else
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if:
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%buf.load = load ptr, ptr %buf, !nonnull !0, !noundef !0
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ret ptr %buf.load
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else:
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%buf.load2 = load ptr, ptr %buf, !nonnull !0, !noundef !0
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ret ptr %buf.load2
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}
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!0 = !{}
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