| ; RUN: opt -S -basicaa -newgvn < %s | FileCheck %s | |
| ; RUN: opt -S -basicaa -newgvn -disable-simplify-libcalls < %s | FileCheck %s -check-prefix=CHECK_NO_LIBCALLS | |
| ; Check that loads from calloc are recognized as being zero. | |
| target 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" | |
| ; Function Attrs: nounwind uwtable | |
| define i32 @test1() { | |
| %1 = tail call noalias i8* @calloc(i64 1, i64 4) | |
| %2 = bitcast i8* %1 to i32* | |
| ; This load is trivially constant zero | |
| %3 = load i32, i32* %2, align 4 | |
| ret i32 %3 | |
| ; CHECK-LABEL: @test1( | |
| ; CHECK-NOT: %3 = load i32, i32* %2, align 4 | |
| ; CHECK: ret i32 0 | |
| ; CHECK_NO_LIBCALLS-LABEL: @test1( | |
| ; CHECK_NO_LIBCALLS: load | |
| ; CHECK_NO_LIBCALLS: ret i32 % | |
| } | |
| declare noalias i8* @calloc(i64, i64) |