1*9880d681SAndroid Build Coastguard Worker; RUN: opt -S -basicaa -gvn < %s | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker; RUN: opt -S -basicaa -gvn -disable-simplify-libcalls < %s | FileCheck %s -check-prefix=CHECK_NO_LIBCALLS 3*9880d681SAndroid Build Coastguard Worker; Check that loads from calloc are recognized as being zero. 4*9880d681SAndroid Build Coastguard Worker 5*9880d681SAndroid Build Coastguard Workertarget datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" 6*9880d681SAndroid Build Coastguard Worker 7*9880d681SAndroid Build Coastguard Worker; Function Attrs: nounwind uwtable 8*9880d681SAndroid Build Coastguard Workerdefine i32 @test1() { 9*9880d681SAndroid Build Coastguard Worker %1 = tail call noalias i8* @calloc(i64 1, i64 4) 10*9880d681SAndroid Build Coastguard Worker %2 = bitcast i8* %1 to i32* 11*9880d681SAndroid Build Coastguard Worker ; This load is trivially constant zero 12*9880d681SAndroid Build Coastguard Worker %3 = load i32, i32* %2, align 4 13*9880d681SAndroid Build Coastguard Worker ret i32 %3 14*9880d681SAndroid Build Coastguard Worker 15*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @test1( 16*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: %3 = load i32, i32* %2, align 4 17*9880d681SAndroid Build Coastguard Worker; CHECK: ret i32 0 18*9880d681SAndroid Build Coastguard Worker 19*9880d681SAndroid Build Coastguard Worker; CHECK_NO_LIBCALLS-LABEL: @test1( 20*9880d681SAndroid Build Coastguard Worker; CHECK_NO_LIBCALLS: load 21*9880d681SAndroid Build Coastguard Worker; CHECK_NO_LIBCALLS: ret i32 % 22*9880d681SAndroid Build Coastguard Worker 23*9880d681SAndroid Build Coastguard Worker} 24*9880d681SAndroid Build Coastguard Worker 25*9880d681SAndroid Build Coastguard Workerdeclare noalias i8* @calloc(i64, i64) 26