| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4 |
| ; RUN: opt -S -passes=newgvn < %s | FileCheck %s |
| ; 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() { |
| ; CHECK-LABEL: define i32 @test1() { |
| ; CHECK-NEXT: [[TMP1:%.*]] = tail call noalias ptr @calloc(i64 1, i64 4) |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| %1 = tail call noalias ptr @calloc(i64 1, i64 4) |
| ; This load is trivially constant zero |
| %2 = load i32, ptr %1, align 4 |
| ret i32 %2 |
| |
| } |
| |
| declare noalias ptr @calloc(i64, i64) mustprogress nofree nounwind willreturn allockind("alloc,zeroed") allocsize(0,1) "alloc-family"="malloc" |
