147 lines
4.1 KiB
LLVM
147 lines
4.1 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
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; RUN: opt -S -codegenprepare %s -mtriple=x86_64-apple-darwin -o - | FileCheck %s --check-prefix OPT
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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-LABEL: 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-LABEL: 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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; Correctly handle zext returns.
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declare zeroext i1 @foo_i1()
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; CHECK-LABEL: zext_i1
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; CHECK: jmp _foo_i1
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define zeroext i1 @zext_i1(i1 %k) {
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entry:
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br i1 %k, label %land.end, label %land.rhs
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land.rhs: ; preds = %entry
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%call1 = tail call zeroext i1 @foo_i1()
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br label %land.end
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land.end: ; preds = %entry, %land.rhs
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%0 = phi i1 [ false, %entry ], [ %call1, %land.rhs ]
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ret i1 %0
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}
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; We need to look through bitcasts when looking for tail calls in phi incoming
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; values.
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declare i32* @g_ret32()
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define i8* @f_ret8(i8* %obj) nounwind {
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; OPT-LABEL: @f_ret8(
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; OPT-NEXT: entry:
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; OPT-NEXT: [[CMP:%.*]] = icmp eq i8* [[OBJ:%.*]], null
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; OPT-NEXT: br i1 [[CMP]], label [[RETURN:%.*]], label [[IF_THEN:%.*]]
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; OPT: if.then:
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; OPT-NEXT: [[PTR:%.*]] = tail call i32* @g_ret32()
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; OPT-NEXT: [[CASTED:%.*]] = bitcast i32* [[PTR]] to i8*
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; OPT-NEXT: ret i8* [[CASTED]]
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; OPT: return:
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; OPT-NEXT: ret i8* [[OBJ]]
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;
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; CHECK-LABEL: f_ret8:
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; CHECK: ## %bb.0: ## %entry
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; CHECK-NEXT: testq %rdi, %rdi
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; CHECK-NEXT: je LBB3_1
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; CHECK-NEXT: ## %bb.2: ## %if.then
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; CHECK-NEXT: jmp _g_ret32 ## TAILCALL
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; CHECK-NEXT: LBB3_1: ## %return
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; CHECK-NEXT: movq %rdi, %rax
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; CHECK-NEXT: retq
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entry:
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%cmp = icmp eq i8* %obj, null
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br i1 %cmp, label %return, label %if.then
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if.then:
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%ptr = tail call i32* @g_ret32()
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%casted = bitcast i32* %ptr to i8*
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br label %return
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return:
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%retval = phi i8* [ %casted, %if.then ], [ %obj, %entry ]
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ret i8* %retval
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}
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