1 ; RUN: llc < %s -mcpu=generic -march=x86 | FileCheck %s 2 %struct._obstack_chunk = type { i8*, %struct._obstack_chunk*, [4 x i8] } 3 %struct.obstack = type { i32, %struct._obstack_chunk*, i8*, i8*, i8*, i32, i32, %struct._obstack_chunk* (...)*, void (...)*, i8*, i8 } 4 @stmt_obstack = external global %struct.obstack ; <%struct.obstack*> [#uses=1] 5 6 ; This should just not crash. 7 define void @test1() nounwind { 8 entry: 9 br i1 true, label %cond_true, label %cond_next 10 11 cond_true: ; preds = %entry 12 %new_size.0.i = select i1 false, i32 0, i32 0 ; <i32> [#uses=1] 13 %tmp.i = load i32, i32* bitcast (i8* getelementptr (%struct.obstack, %struct.obstack* @stmt_obstack, i32 0, i32 10) to i32*) ; <i32> [#uses=1] 14 %tmp.i.upgrd.1 = trunc i32 %tmp.i to i8 ; <i8> [#uses=1] 15 %tmp21.i = and i8 %tmp.i.upgrd.1, 1 ; <i8> [#uses=1] 16 %tmp22.i = icmp eq i8 %tmp21.i, 0 ; <i1> [#uses=1] 17 br i1 %tmp22.i, label %cond_false30.i, label %cond_true23.i 18 19 cond_true23.i: ; preds = %cond_true 20 ret void 21 22 cond_false30.i: ; preds = %cond_true 23 %tmp35.i = tail call %struct._obstack_chunk* null( i32 %new_size.0.i ) ; <%struct._obstack_chunk*> [#uses=0] 24 ret void 25 26 cond_next: ; preds = %entry 27 ret void 28 } 29 30 31 32 define i32 @test2(i16* %P, i16* %Q) nounwind { 33 %A = load i16, i16* %P, align 4 ; <i16> [#uses=11] 34 %C = zext i16 %A to i32 ; <i32> [#uses=1] 35 %D = and i32 %C, 255 ; <i32> [#uses=1] 36 br label %L 37 L: 38 39 store i16 %A, i16* %Q 40 ret i32 %D 41 42 ; CHECK-LABEL: test2: 43 ; CHECK: movl 4(%esp), %eax 44 ; CHECK-NEXT: movzwl (%eax), %e{{..}} 45 46 } 47 48 ; rdar://10554090 49 ; xor in exit block will be CSE'ed and load will be folded to xor in entry. 50 define i1 @test3(i32* %P, i32* %Q) nounwind { 51 ; CHECK-LABEL: test3: 52 ; CHECK: movl 8(%esp), %e 53 ; CHECK: movl 4(%esp), %e 54 ; CHECK: xorl (%e 55 ; CHECK: j 56 entry: 57 %0 = load i32, i32* %P, align 4 58 %1 = load i32, i32* %Q, align 4 59 %2 = xor i32 %0, %1 60 %3 = and i32 %2, 89947 61 %4 = icmp eq i32 %3, 0 62 br i1 %4, label %exit, label %land.end 63 64 exit: 65 %shr.i.i19 = xor i32 %1, %0 66 %5 = and i32 %shr.i.i19, 3456789123 67 %6 = icmp eq i32 %5, 0 68 br label %land.end 69 70 land.end: 71 %7 = phi i1 [ %6, %exit ], [ false, %entry ] 72 ret i1 %7 73 } 74
