| Evan Cheng | 801d98b | 2012-01-04 01:55:04 +0000 | [diff] [blame] | 1 | ; RUN: llc < %s -mtriple=thumbv7-apple-ios -mcpu=cortex-a9 | FileCheck %s |
| Andrew Trick | 6446bf7 | 2011-08-25 17:50:53 +0000 | [diff] [blame] | 2 | ; Test that ldmia_ret preserves implicit operands for return values. |
| 3 | ; |
| 4 | ; This CFG is reduced from a benchmark miscompile. With current |
| 5 | ; if-conversion heuristics, one of the return paths is if-converted |
| 6 | ; into sw.bb18 resulting in an ldmia_ret in the middle of the |
| 7 | ; block. The postra scheduler needs to know that the return implicitly |
| 8 | ; uses the return register, otherwise its antidep breaker scavenges |
| 9 | ; the register in order to hoist the constant load required to test |
| 10 | ; the switch. |
| 11 | |
| 12 | declare i32 @getint() |
| 13 | declare i1 @getbool() |
| 14 | declare void @foo(i32) |
| 15 | declare i32 @bar(i32) |
| 16 | |
| 17 | define i32 @test(i32 %in1, i32 %in2) nounwind { |
| 18 | entry: |
| 19 | %call = tail call zeroext i1 @getbool() nounwind |
| 20 | br i1 %call, label %sw.bb18, label %sw.bb2 |
| 21 | |
| 22 | sw.bb2: ; preds = %entry |
| 23 | %cmp = tail call zeroext i1 @getbool() nounwind |
| 24 | br i1 %cmp, label %sw.epilog58, label %land.lhs.true |
| 25 | |
| 26 | land.lhs.true: ; preds = %sw.bb2 |
| 27 | %cmp13 = tail call zeroext i1 @getbool() nounwind |
| 28 | br i1 %cmp13, label %if.then, label %sw.epilog58 |
| 29 | |
| 30 | if.then: ; preds = %land.lhs.true |
| 31 | tail call void @foo(i32 %in1) nounwind |
| 32 | br label %sw.epilog58 |
| 33 | |
| 34 | ; load the return value |
| 35 | ; CHECK: movs [[RRET:r.]], #2 |
| 36 | ; hoist the switch constant without clobbering RRET |
| 37 | ; CHECK: movw |
| 38 | ; CHECK-NOT: [[RRET]] |
| 39 | ; CHECK: , #63707 |
| 40 | ; CHECK-NOT: [[RRET]] |
| 41 | ; CHECK: tst |
| 42 | ; If-convert the return |
| 43 | ; CHECK: it ne |
| 44 | ; Fold the CSR+return into a pop |
| Andrew Trick | e2431c6 | 2013-05-25 03:08:10 +0000 | [diff] [blame^] | 45 | ; CHECK: pop {r4, r5, r6, r7, pc} |
| Andrew Trick | 6446bf7 | 2011-08-25 17:50:53 +0000 | [diff] [blame] | 46 | sw.bb18: |
| 47 | %call20 = tail call i32 @bar(i32 %in2) nounwind |
| 48 | switch i32 %call20, label %sw.default56 [ |
| 49 | i32 168, label %sw.bb21 |
| 50 | i32 165, label %sw.bb21 |
| 51 | i32 261, label %sw.epilog58 |
| 52 | i32 188, label %sw.epilog58 |
| 53 | i32 187, label %sw.epilog58 |
| 54 | i32 186, label %sw.epilog58 |
| 55 | i32 185, label %sw.epilog58 |
| 56 | i32 184, label %sw.epilog58 |
| 57 | i32 175, label %sw.epilog58 |
| 58 | i32 174, label %sw.epilog58 |
| 59 | i32 173, label %sw.epilog58 |
| 60 | i32 172, label %sw.epilog58 |
| 61 | i32 171, label %sw.epilog58 |
| 62 | i32 167, label %sw.epilog58 |
| 63 | i32 166, label %sw.epilog58 |
| 64 | i32 164, label %sw.epilog58 |
| 65 | i32 163, label %sw.epilog58 |
| 66 | i32 161, label %sw.epilog58 |
| 67 | i32 160, label %sw.epilog58 |
| 68 | i32 -1, label %sw.bb33 |
| 69 | ] |
| 70 | |
| 71 | sw.bb21: ; preds = %sw.bb18, %sw.bb18 |
| 72 | tail call void @foo(i32 %in2) nounwind |
| 73 | %call28 = tail call i32 @getint() nounwind |
| 74 | %tobool = icmp eq i32 %call28, 0 |
| 75 | br i1 %tobool, label %if.then29, label %sw.epilog58 |
| 76 | |
| 77 | if.then29: ; preds = %sw.bb21 |
| 78 | tail call void @foo(i32 %in2) nounwind |
| 79 | br label %sw.epilog58 |
| 80 | |
| 81 | sw.bb33: ; preds = %sw.bb18 |
| 82 | %cmp42 = tail call zeroext i1 @getbool() nounwind |
| 83 | br i1 %cmp42, label %sw.default56, label %land.lhs.true44 |
| 84 | |
| 85 | land.lhs.true44: ; preds = %sw.bb33 |
| 86 | %call50 = tail call i32 @getint() nounwind |
| 87 | %cmp51 = icmp slt i32 %call50, 0 |
| 88 | br i1 %cmp51, label %if.then53, label %sw.default56 |
| 89 | |
| 90 | if.then53: ; preds = %land.lhs.true44 |
| 91 | tail call void @foo(i32 %in2) nounwind |
| 92 | br label %sw.default56 |
| 93 | |
| 94 | sw.default56: ; preds = %sw.bb33, %land.lhs.true44, %if.then53, %sw.bb18 |
| 95 | br label %sw.epilog58 |
| 96 | |
| 97 | sw.epilog58: |
| 98 | %retval.0 = phi i32 [ 4, %sw.default56 ], [ 2, %sw.bb21 ], [ 2, %if.then29 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb18 ], [ 2, %sw.bb2 ], [ 2, %land.lhs.true ], [ 2, %if.then ] |
| 99 | ret i32 %retval.0 |
| 100 | } |