| ; RUN: llc < %s -mtriple=thumbv7-apple-ios -mcpu=cortex-a9 -jump-table-density=40 | FileCheck %s |
| ; Test that ldmia_ret preserves implicit operands for return values. |
| ; |
| ; This CFG is reduced from a benchmark miscompile. With current |
| ; if-conversion heuristics, one of the return paths is if-converted |
| ; into sw.bb18 resulting in an ldmia_ret in the middle of the |
| ; block. The postra scheduler needs to know that the return implicitly |
| ; uses the return register, otherwise its antidep breaker scavenges |
| ; the register in order to hoist the constant load required to test |
| ; the switch. |
| |
| declare i32 @getint() |
| declare i1 @getbool() |
| declare void @foo(i32) |
| declare i32 @bar(i32) |
| |
| define i32 @test(i32 %in1, i32 %in2) nounwind "no-frame-pointer-elim"="true" { |
| entry: |
| %call = tail call zeroext i1 @getbool() nounwind |
| br i1 %call, label %sw.bb18, label %sw.bb2 |
| |
| sw.bb2: ; preds = %entry |
| %cmp = tail call zeroext i1 @getbool() nounwind |
| br i1 %cmp, label %sw.epilog58, label %land.lhs.true |
| |
| land.lhs.true: ; preds = %sw.bb2 |
| %cmp13 = tail call zeroext i1 @getbool() nounwind |
| br i1 %cmp13, label %if.then, label %sw.epilog58 |
| |
| if.then: ; preds = %land.lhs.true |
| tail call void @foo(i32 %in1) nounwind |
| br label %sw.epilog58 |
| |
| ; load the return value |
| ; CHECK: movs [[RRET:r.]], #2 |
| ; hoist the switch constant without clobbering RRET |
| ; CHECK: movw |
| ; CHECK-NOT: [[RRET]] |
| ; CHECK: , #63707 |
| ; CHECK-NOT: [[RRET]] |
| ; CHECK: tst |
| ; If-convert the return |
| ; CHECK: it ne |
| ; Fold the CSR+return into a pop |
| ; CHECK: pop {r4, r5, r7, pc} |
| sw.bb18: |
| %call20 = tail call i32 @bar(i32 %in2) nounwind |
| switch i32 %call20, label %sw.default56 [ |
| i32 168, label %sw.bb21 |
| i32 165, label %sw.bb21 |
| i32 261, label %sw.epilog58 |
| i32 188, label %sw.epilog58 |
| i32 187, label %sw.epilog58 |
| i32 186, label %sw.epilog58 |
| i32 185, label %sw.epilog58 |
| i32 184, label %sw.epilog58 |
| i32 175, label %sw.epilog58 |
| i32 174, label %sw.epilog58 |
| i32 173, label %sw.epilog58 |
| i32 172, label %sw.epilog58 |
| i32 171, label %sw.epilog58 |
| i32 167, label %sw.epilog58 |
| i32 166, label %sw.epilog58 |
| i32 164, label %sw.epilog58 |
| i32 163, label %sw.epilog58 |
| i32 161, label %sw.epilog58 |
| i32 160, label %sw.epilog58 |
| i32 -1, label %sw.bb33 |
| ] |
| |
| sw.bb21: ; preds = %sw.bb18, %sw.bb18 |
| tail call void @foo(i32 %in2) nounwind |
| %call28 = tail call i32 @getint() nounwind |
| %tobool = icmp eq i32 %call28, 0 |
| br i1 %tobool, label %if.then29, label %sw.epilog58 |
| |
| if.then29: ; preds = %sw.bb21 |
| tail call void @foo(i32 %in2) nounwind |
| br label %sw.epilog58 |
| |
| sw.bb33: ; preds = %sw.bb18 |
| %cmp42 = tail call zeroext i1 @getbool() nounwind |
| br i1 %cmp42, label %sw.default56, label %land.lhs.true44 |
| |
| land.lhs.true44: ; preds = %sw.bb33 |
| %call50 = tail call i32 @getint() nounwind |
| %cmp51 = icmp slt i32 %call50, 0 |
| br i1 %cmp51, label %if.then53, label %sw.default56 |
| |
| if.then53: ; preds = %land.lhs.true44 |
| tail call void @foo(i32 %in2) nounwind |
| br label %sw.default56 |
| |
| sw.default56: ; preds = %sw.bb33, %land.lhs.true44, %if.then53, %sw.bb18 |
| br label %sw.epilog58 |
| |
| sw.epilog58: |
| %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 ] |
| ret i32 %retval.0 |
| } |