xref: /aosp_15_r20/external/llvm/test/Transforms/GVN/calloc-load-removal.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58)
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