| Dan Gohman | 4d70a29 | 2010-11-11 21:23:25 +0000 | [diff] [blame] | 1 | ; RUN: opt -simplifycfg -S < %s | FileCheck %s |
| 2 | |
| 3 | ; This load is safe to speculate, as it's from a safe offset |
| 4 | ; within an alloca. |
| 5 | |
| 6 | ; CHECK: @yes |
| 7 | ; CHECK-NOT: br |
| 8 | |
| 9 | define void @yes(i1 %c) nounwind { |
| 10 | entry: |
| 11 | %a = alloca [4 x i64*], align 8 |
| 12 | %__a.addr = getelementptr [4 x i64*]* %a, i64 0, i64 3 |
| 13 | call void @frob(i64** %__a.addr) |
| 14 | br i1 %c, label %if.then, label %if.end |
| 15 | |
| 16 | if.then: ; preds = %entry |
| 17 | br label %return |
| 18 | |
| 19 | if.end: ; preds = %entry |
| 20 | %tmp5 = load i64** %__a.addr, align 8 |
| 21 | br label %return |
| 22 | |
| 23 | return: ; preds = %if.end, %if.then |
| 24 | %storemerge = phi i64* [ undef, %if.then ], [ %tmp5, %if.end ] |
| 25 | ret void |
| 26 | } |
| 27 | |
| 28 | ; CHECK: @no0 |
| 29 | ; CHECK: br i1 %c |
| 30 | |
| 31 | define void @no0(i1 %c) nounwind { |
| 32 | entry: |
| 33 | %a = alloca [4 x i64*], align 8 |
| 34 | %__a.addr = getelementptr [4 x i64*]* %a, i64 0, i64 4 |
| 35 | call void @frob(i64** %__a.addr) |
| 36 | br i1 %c, label %if.then, label %if.end |
| 37 | |
| 38 | if.then: ; preds = %entry |
| 39 | br label %return |
| 40 | |
| 41 | if.end: ; preds = %entry |
| 42 | %tmp5 = load i64** %__a.addr, align 8 |
| 43 | br label %return |
| 44 | |
| 45 | return: ; preds = %if.end, %if.then |
| 46 | %storemerge = phi i64* [ undef, %if.then ], [ %tmp5, %if.end ] |
| 47 | ret void |
| 48 | } |
| 49 | |
| 50 | ; CHECK: @no1 |
| 51 | ; CHECK: br i1 %c |
| 52 | |
| 53 | define void @no1(i1 %c, i64 %n) nounwind { |
| 54 | entry: |
| 55 | %a = alloca [4 x i64*], align 8 |
| 56 | %__a.addr = getelementptr [4 x i64*]* %a, i64 0, i64 %n |
| 57 | call void @frob(i64** %__a.addr) |
| 58 | br i1 %c, label %if.then, label %if.end |
| 59 | |
| 60 | if.then: ; preds = %entry |
| 61 | br label %return |
| 62 | |
| 63 | if.end: ; preds = %entry |
| 64 | %tmp5 = load i64** %__a.addr, align 8 |
| 65 | br label %return |
| 66 | |
| 67 | return: ; preds = %if.end, %if.then |
| 68 | %storemerge = phi i64* [ undef, %if.then ], [ %tmp5, %if.end ] |
| 69 | ret void |
| 70 | } |
| 71 | |
| 72 | ; CHECK: @no2 |
| 73 | ; CHECK: br i1 %c |
| 74 | |
| 75 | define void @no2(i1 %c, i64 %n) nounwind { |
| 76 | entry: |
| 77 | %a = alloca [4 x i64*], align 8 |
| 78 | %__a.addr = getelementptr [4 x i64*]* %a, i64 1, i64 0 |
| 79 | call void @frob(i64** %__a.addr) |
| 80 | br i1 %c, label %if.then, label %if.end |
| 81 | |
| 82 | if.then: ; preds = %entry |
| 83 | br label %return |
| 84 | |
| 85 | if.end: ; preds = %entry |
| 86 | %tmp5 = load i64** %__a.addr, align 8 |
| 87 | br label %return |
| 88 | |
| 89 | return: ; preds = %if.end, %if.then |
| 90 | %storemerge = phi i64* [ undef, %if.then ], [ %tmp5, %if.end ] |
| 91 | ret void |
| 92 | } |
| 93 | |
| 94 | declare void @frob(i64** nocapture %p) |