| Sanjoy Das | a37bb4a | 2016-06-26 05:10:45 +0000 | [diff] [blame] | 1 | ; RUN: opt -S -loop-unswitch < %s | FileCheck %s |
| 2 | |
| 3 | declare void @llvm.experimental.guard(i1, ...) |
| 4 | |
| 5 | define void @f_0(i32 %n, i32* %ptr, i1 %c) { |
| 6 | ; CHECK-LABEL: @f_0( |
| 7 | ; CHECK: loop.us: |
| 8 | ; CHECK-NOT: guard |
| 9 | ; CHECK: loop: |
| 10 | ; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] |
| 11 | entry: |
| 12 | br label %loop |
| 13 | |
| 14 | loop: |
| 15 | %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] |
| 16 | %iv.inc = add i32 %iv, 1 |
| 17 | call void(i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"() ] |
| 18 | store volatile i32 0, i32* %ptr |
| 19 | %becond = icmp ult i32 %iv.inc, %n |
| 20 | br i1 %becond, label %leave, label %loop |
| 21 | |
| 22 | leave: |
| 23 | ret void |
| 24 | } |
| 25 | |
| 26 | define void @f_1(i32 %n, i32* %ptr, i1 %c_0, i1 %c_1) { |
| 27 | ; CHECK-LABEL: @f_1( |
| 28 | ; CHECK: loop.us.us: |
| 29 | ; CHECK-NOT: guard |
| 30 | ; CHECK: loop.us: |
| 31 | ; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 2) ] |
| 32 | ; CHECK-NOT: guard |
| 33 | ; CHECK: loop.us1: |
| 34 | ; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 1) ] |
| 35 | ; CHECK-NOT: guard |
| 36 | ; CHECK: loop: |
| 37 | ; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 1) ] |
| 38 | ; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 2) ] |
| 39 | entry: |
| 40 | br label %loop |
| 41 | |
| 42 | loop: |
| 43 | %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] |
| 44 | %iv.inc = add i32 %iv, 1 |
| 45 | call void(i1, ...) @llvm.experimental.guard(i1 %c_0) [ "deopt"(i32 1) ] |
| 46 | store volatile i32 0, i32* %ptr |
| 47 | call void(i1, ...) @llvm.experimental.guard(i1 %c_1) [ "deopt"(i32 2) ] |
| 48 | %becond = icmp ult i32 %iv.inc, %n |
| 49 | br i1 %becond, label %leave, label %loop |
| 50 | |
| 51 | leave: |
| 52 | ret void |
| 53 | } |
| 54 | |
| 55 | ; Basic negative test |
| 56 | |
| 57 | define void @f_3(i32 %n, i32* %ptr, i1* %c_ptr) { |
| 58 | ; CHECK-LABEL: @f_3( |
| 59 | ; CHECK-NOT: loop.us: |
| 60 | entry: |
| 61 | br label %loop |
| 62 | |
| 63 | loop: |
| 64 | %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] |
| 65 | %iv.inc = add i32 %iv, 1 |
| 66 | %c = load volatile i1, i1* %c_ptr |
| 67 | call void(i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"() ] |
| 68 | store volatile i32 0, i32* %ptr |
| 69 | %becond = icmp ult i32 %iv.inc, %n |
| 70 | br i1 %becond, label %leave, label %loop |
| 71 | |
| 72 | leave: |
| 73 | ret void |
| 74 | } |
| 75 | |
| 76 | define void @f_4(i32 %n, i32* %ptr, i1 %c) { |
| 77 | ; CHECK-LABEL: @f_4( |
| 78 | ; |
| 79 | ; Demonstrate that unswitching on one guard can cause another guard to |
| 80 | ; be erased (this has implications on what guards we can keep raw |
| 81 | ; pointers to). |
| 82 | entry: |
| 83 | br label %loop |
| 84 | |
| 85 | loop: |
| 86 | %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] |
| 87 | %iv.inc = add i32 %iv, 1 |
| 88 | call void(i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"(i32 1) ] |
| 89 | store volatile i32 0, i32* %ptr |
| 90 | %neg = xor i1 %c, 1 |
| 91 | call void(i1, ...) @llvm.experimental.guard(i1 %neg) [ "deopt"(i32 2) ] |
| 92 | %becond = icmp ult i32 %iv.inc, %n |
| 93 | br i1 %becond, label %leave, label %loop |
| 94 | |
| 95 | leave: |
| 96 | ret void |
| 97 | } |