101 lines
3.8 KiB
LLVM
101 lines
3.8 KiB
LLVM
; 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
|
|
}
|