1; RUN: opt -S -passes=gvn < %s | FileCheck %s 2; Check that loads from calloc are recognized as being zero. 3 4target 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" 5 6; Function Attrs: nounwind uwtable 7define i32 @test1() { 8 %1 = tail call noalias ptr @calloc(i64 1, i64 4) 9 ; This load is trivially constant zero 10 %2 = load i32, ptr %1, align 4 11 ret i32 %2 12 13; CHECK-LABEL: @test1( 14; CHECK-NOT: %2 = load i32, ptr %1, align 4 15; CHECK: ret i32 0 16 17; CHECK_NO_LIBCALLS-LABEL: @test1( 18; CHECK_NO_LIBCALLS: load 19; CHECK_NO_LIBCALLS: ret i32 % 20 21} 22 23define i32 @as_invoke(i1 %c) personality ptr undef { 24bb3: 25 %mem = invoke noalias ptr @calloc(i64 1, i64 4) 26 to label %bb4 unwind label %bb1 27 28bb1: 29 %lp = landingpad { ptr, i32 } cleanup 30 ret i32 0 31 32bb4: 33 ; This load is trivially constant zero 34 %res = load i32, ptr %mem, align 4 35 ret i32 %res 36 37; CHECK-LABEL: @as_invoke( 38; CHECK-NOT: %3 = load i32, ptr %2, align 4 39; CHECK: ret i32 0 40 41; CHECK_NO_LIBCALLS-LABEL: @as_invoke( 42; CHECK_NO_LIBCALLS: load 43; CHECK_NO_LIBCALLS: ret i32 % 44} 45 46declare noalias ptr @calloc(i64, i64) allockind("alloc,zeroed") allocsize(0,1) 47