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f318924b28
into predecessor blocks to enable tail call optimization. rdar://11958338 llvm-svn: 160894
88 lines
2.4 KiB
LLVM
88 lines
2.4 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
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; Teach CGP to dup returns to enable tail call optimization.
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; rdar://9147433
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define i32 @foo(i32 %x) nounwind ssp {
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; CHECK: foo:
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entry:
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switch i32 %x, label %return [
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i32 1, label %sw.bb
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i32 2, label %sw.bb1
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i32 3, label %sw.bb3
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i32 4, label %sw.bb5
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i32 5, label %sw.bb7
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i32 6, label %sw.bb9
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]
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sw.bb: ; preds = %entry
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; CHECK: jmp _f1
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%call = tail call i32 @f1() nounwind
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br label %return
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sw.bb1: ; preds = %entry
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; CHECK: jmp _f2
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%call2 = tail call i32 @f2() nounwind
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br label %return
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sw.bb3: ; preds = %entry
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; CHECK: jmp _f3
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%call4 = tail call i32 @f3() nounwind
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br label %return
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sw.bb5: ; preds = %entry
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; CHECK: jmp _f4
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%call6 = tail call i32 @f4() nounwind
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br label %return
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sw.bb7: ; preds = %entry
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; CHECK: jmp _f5
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%call8 = tail call i32 @f5() nounwind
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br label %return
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sw.bb9: ; preds = %entry
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; CHECK: jmp _f6
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%call10 = tail call i32 @f6() nounwind
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br label %return
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return: ; preds = %entry, %sw.bb9, %sw.bb7, %sw.bb5, %sw.bb3, %sw.bb1, %sw.bb
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%retval.0 = phi i32 [ %call10, %sw.bb9 ], [ %call8, %sw.bb7 ], [ %call6, %sw.bb5 ], [ %call4, %sw.bb3 ], [ %call2, %sw.bb1 ], [ %call, %sw.bb ], [ 0, %entry ]
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ret i32 %retval.0
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}
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declare i32 @f1()
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declare i32 @f2()
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declare i32 @f3()
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declare i32 @f4()
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declare i32 @f5()
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declare i32 @f6()
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; rdar://11958338
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%0 = type opaque
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declare i8* @bar(i8*) uwtable optsize noinline ssp
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define hidden %0* @thingWithValue(i8* %self) uwtable ssp {
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entry:
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; CHECK: thingWithValue:
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; CHECK: jmp _bar
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br i1 undef, label %if.then.i, label %if.else.i
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if.then.i: ; preds = %entry
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br label %someThingWithValue.exit
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if.else.i: ; preds = %entry
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%call4.i = tail call i8* @bar(i8* undef) optsize
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br label %someThingWithValue.exit
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someThingWithValue.exit: ; preds = %if.else.i, %if.then.i
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%retval.0.in.i = phi i8* [ undef, %if.then.i ], [ %call4.i, %if.else.i ]
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%retval.0.i = bitcast i8* %retval.0.in.i to %0*
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ret %0* %retval.0.i
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}
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