| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| define i8* @example(i8* dereferenceable(24) %x) { |
| ; CHECK-LABEL: @example( |
| ; CHECK-NEXT: [[X2:%.*]] = bitcast i8* [[X:%.*]] to {}** |
| ; CHECK-NEXT: [[Y:%.*]] = load {}*, {}** [[X2]], align 8 |
| ; CHECK-NEXT: [[Y_IS_NULL:%.*]] = icmp ne {}* [[Y]], null |
| ; CHECK-NEXT: call void @llvm.assume(i1 [[Y_IS_NULL]]) |
| ; CHECK-NEXT: ret i8* [[X]] |
| ; |
| %x2 = bitcast i8* %x to {}** |
| %y = load {}*, {}** %x2, align 8 |
| %y_is_null = icmp eq {}* %y, null |
| |
| %x0 = getelementptr inbounds i8, i8* %x, i64 0 |
| %res = select i1 %y_is_null, i8* null, i8* %x0 |
| |
| %nonnull = icmp ne i8* %res, null |
| call void @llvm.assume(i1 %nonnull) |
| |
| ret i8* %res |
| } |
| |
| ; TODO: this should be folded to `ret i8* %x` as well. |
| define i8* @example2(i8* %x) { |
| ; CHECK-LABEL: @example2( |
| ; CHECK-NEXT: [[X2:%.*]] = bitcast i8* [[X:%.*]] to {}** |
| ; CHECK-NEXT: [[Y:%.*]] = load {}*, {}** [[X2]], align 8 |
| ; CHECK-NEXT: [[Y_IS_NULL:%.*]] = icmp eq {}* [[Y]], null |
| ; CHECK-NEXT: [[RES:%.*]] = select i1 [[Y_IS_NULL]], i8* null, i8* [[X]] |
| ; CHECK-NEXT: [[NONNULL:%.*]] = icmp ne i8* [[RES]], null |
| ; CHECK-NEXT: call void @llvm.assume(i1 [[NONNULL]]) |
| ; CHECK-NEXT: ret i8* [[RES]] |
| ; |
| %x2 = bitcast i8* %x to {}** |
| %y = load {}*, {}** %x2, align 8 |
| %y_is_null = icmp eq {}* %y, null |
| |
| %x0 = getelementptr inbounds i8, i8* %x, i64 0 |
| %res = select i1 %y_is_null, i8* null, i8* %x0 |
| |
| %nonnull = icmp ne i8* %res, null |
| call void @llvm.assume(i1 %nonnull) |
| |
| ret i8* %res |
| } |
| |
| declare void @llvm.assume(i1) |