a6492e2271
Summary: New `@test13` in `Attributor/align.ll` is the main motivation - `null` pointer really does not limit our alignment knowledge, in fact it is fully aligned since it has no bits set. Here we don't special-case `null` pointer because it is somewhat controversial to add one more place where we enforce that `null` pointer is zero, but instead we do the more general thing of trying to perform constant-fold of pointer constant to an integer, and perform alignment inferrment on that. Reviewers: jdoerfert, gchatelet, courbet, sstefan1 Reviewed By: jdoerfert Subscribers: hiraditya, arphaman, jfb, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D73131
97 lines
4.0 KiB
LLVM
97 lines
4.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --scrub-attributes
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; RUN: opt -S -passes=attributor -aa-pipeline='basic-aa' -attributor-disable=false -attributor-max-iterations-verify -attributor-max-iterations=1 < %s | FileCheck %s
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;
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; #include <pthread.h>
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;
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; void *GlobalVPtr;
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;
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; static void *foo(void *arg) { return arg; }
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; static void *bar(void *arg) { return arg; }
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;
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; int main() {
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; pthread_t thread;
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; pthread_create(&thread, NULL, foo, NULL);
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; pthread_create(&thread, NULL, bar, &GlobalVPtr);
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; return 0;
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; }
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;
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; Verify the constant values NULL and &GlobalVPtr are propagated into foo and
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; bar, respectively.
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;
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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%union.pthread_attr_t = type { i64, [48 x i8] }
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@GlobalVPtr = common dso_local global i8* null, align 8
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; FIXME: nocapture & noalias for @GlobalVPtr in %call1
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; FIXME: nocapture & noalias for %alloc2 in %call3
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define dso_local i32 @main() {
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; CHECK-LABEL: define {{[^@]+}}@main()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ALLOC1:%.*]] = alloca i8, align 8
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; CHECK-NEXT: [[ALLOC2:%.*]] = alloca i8, align 8
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; CHECK-NEXT: [[THREAD:%.*]] = alloca i64, align 8
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; CHECK-NEXT: [[CALL:%.*]] = call i32 @pthread_create(i64* nonnull align 8 dereferenceable(8) [[THREAD]], %union.pthread_attr_t* noalias align 536870912 null, i8* (i8*)* nonnull @foo, i8* noalias nofree readnone align 536870912 null)
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; CHECK-NEXT: [[CALL1:%.*]] = call i32 @pthread_create(i64* nonnull align 8 dereferenceable(8) [[THREAD]], %union.pthread_attr_t* noalias align 536870912 null, i8* (i8*)* nonnull @bar, i8* nofree nonnull readnone align 8 dereferenceable(8) bitcast (i8** @GlobalVPtr to i8*))
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; CHECK-NEXT: [[CALL2:%.*]] = call i32 @pthread_create(i64* nonnull align 8 dereferenceable(8) [[THREAD]], %union.pthread_attr_t* noalias align 536870912 null, i8* (i8*)* nonnull @baz, i8* noalias nocapture nofree nonnull readnone align 8 dereferenceable(1) [[ALLOC1]])
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; CHECK-NEXT: [[CALL3:%.*]] = call i32 @pthread_create(i64* nonnull align 8 dereferenceable(8) [[THREAD]], %union.pthread_attr_t* noalias align 536870912 null, i8* (i8*)* nonnull @buz, i8* nofree nonnull readnone align 8 dereferenceable(1) [[ALLOC2]])
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; CHECK-NEXT: ret i32 0
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;
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entry:
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%alloc1 = alloca i8, align 8
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%alloc2 = alloca i8, align 8
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%thread = alloca i64, align 8
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%call = call i32 @pthread_create(i64* nonnull %thread, %union.pthread_attr_t* null, i8* (i8*)* nonnull @foo, i8* null)
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%call1 = call i32 @pthread_create(i64* nonnull %thread, %union.pthread_attr_t* null, i8* (i8*)* nonnull @bar, i8* bitcast (i8** @GlobalVPtr to i8*))
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%call2 = call i32 @pthread_create(i64* nonnull %thread, %union.pthread_attr_t* null, i8* (i8*)* nonnull @baz, i8* nocapture %alloc1)
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%call3 = call i32 @pthread_create(i64* nonnull %thread, %union.pthread_attr_t* null, i8* (i8*)* nonnull @buz, i8* %alloc2)
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ret i32 0
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}
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declare !callback !0 dso_local i32 @pthread_create(i64*, %union.pthread_attr_t*, i8* (i8*)*, i8*)
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define internal i8* @foo(i8* %arg) {
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; CHECK-LABEL: define {{[^@]+}}@foo
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; CHECK-SAME: (i8* noalias nofree readnone returned align 536870912 [[ARG:%.*]])
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i8* null
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;
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entry:
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ret i8* %arg
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}
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define internal i8* @bar(i8* %arg) {
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; CHECK-LABEL: define {{[^@]+}}@bar
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; CHECK-SAME: (i8* nofree nonnull readnone returned align 8 dereferenceable(8) [[ARG:%.*]])
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i8* bitcast (i8** @GlobalVPtr to i8*)
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;
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entry:
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ret i8* %arg
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}
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define internal i8* @baz(i8* %arg) {
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; CHECK-LABEL: define {{[^@]+}}@baz
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; CHECK-SAME: (i8* noalias nofree nonnull readnone returned align 8 dereferenceable(1) [[ARG:%.*]])
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i8* [[ARG]]
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;
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entry:
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ret i8* %arg
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}
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define internal i8* @buz(i8* %arg) {
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; CHECK-LABEL: define {{[^@]+}}@buz
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; CHECK-SAME: (i8* nofree nonnull readnone returned align 8 dereferenceable(1) [[ARG:%.*]])
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i8* [[ARG]]
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;
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entry:
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ret i8* %arg
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}
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!1 = !{i64 2, i64 3, i1 false}
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!0 = !{!1}
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