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; RUN: opt < %s -tailcallelim -S | FileCheck %s
declare void @noarg()
declare void @use(i32*)
declare void @use_nocapture(i32* nocapture)
declare void @use2_nocapture(i32* nocapture, i32* nocapture)
; Trivial case. Mark @noarg with tail call.
define void @test0() {
; CHECK: tail call void @noarg()
call void @noarg()
ret void
}
; PR615. Make sure that we do not move the alloca so that it interferes with the tail call.
define i32 @test1() {
; CHECK: i32 @test1()
; CHECK-NEXT: alloca
%A = alloca i32 ; <i32*> [#uses=2]
store i32 5, i32* %A
call void @use(i32* %A)
; CHECK: tail call i32 @test1
%X = tail call i32 @test1() ; <i32> [#uses=1]
ret i32 %X
}
; This function contains intervening instructions which should be moved out of the way
define i32 @test2(i32 %X) {
; CHECK: i32 @test2
; CHECK-NOT: call
; CHECK: ret i32
entry:
%tmp.1 = icmp eq i32 %X, 0 ; <i1> [#uses=1]
br i1 %tmp.1, label %then.0, label %endif.0
then.0: ; preds = %entry
%tmp.4 = add i32 %X, 1 ; <i32> [#uses=1]
ret i32 %tmp.4
endif.0: ; preds = %entry
%tmp.10 = add i32 %X, -1 ; <i32> [#uses=1]
%tmp.8 = call i32 @test2(i32 %tmp.10) ; <i32> [#uses=1]
%DUMMY = add i32 %X, 1 ; <i32> [#uses=0]
ret i32 %tmp.8
}
; Though this case seems to be fairly unlikely to occur in the wild, someone
; plunked it into the demo script, so maybe they care about it.
define i32 @test3(i32 %c) {
; CHECK: i32 @test3
; CHECK-NOT: call
; CHECK: ret i32 0
entry:
%tmp.1 = icmp eq i32 %c, 0 ; <i1> [#uses=1]
br i1 %tmp.1, label %return, label %else
else: ; preds = %entry
%tmp.5 = add i32 %c, -1 ; <i32> [#uses=1]
%tmp.3 = call i32 @test3(i32 %tmp.5) ; <i32> [#uses=0]
ret i32 0
return: ; preds = %entry
ret i32 0
}
; Make sure that a nocapture pointer does not stop adding a tail call marker to
; an unrelated call and additionally that we do not mark the nocapture call with
; a tail call.
;
; rdar://14324281
define void @test4() {
; CHECK: void @test4
; CHECK-NOT: tail call void @use_nocapture
; CHECK: tail call void @noarg()
; CHECK: ret void
%a = alloca i32
call void @use_nocapture(i32* %a)
call void @noarg()
ret void
}
; Make sure that we do not perform TRE even with a nocapture use. This is due to
; bad codegen caused by PR962.
;
; rdar://14324281.
define i32* @test5(i32* nocapture %A, i1 %cond) {
; CHECK: i32* @test5
; CHECK-NOT: tailrecurse:
; CHECK: ret i32* null
%B = alloca i32
br i1 %cond, label %cond_true, label %cond_false
cond_true:
call i32* @test5(i32* %B, i1 false)
ret i32* null
cond_false:
call void @use2_nocapture(i32* %A, i32* %B)
call void @noarg()
ret i32* null
}
; PR14143: Make sure that we do not mark functions with nocapture allocas with tail.
;
; rdar://14324281.
define void @test6(i32* %a, i32* %b) {
; CHECK-LABEL: @test6(
; CHECK-NOT: tail call
; CHECK: ret void
%c = alloca [100 x i8], align 16
%tmp = bitcast [100 x i8]* %c to i32*
call void @use2_nocapture(i32* %b, i32* %tmp)
ret void
}
; PR14143: Make sure that we do not mark functions with nocapture allocas with tail.
;
; rdar://14324281
define void @test7(i32* %a, i32* %b) nounwind uwtable {
entry:
; CHECK-LABEL: @test7(
; CHECK-NOT: tail call
; CHECK: ret void
%c = alloca [100 x i8], align 16
%0 = bitcast [100 x i8]* %c to i32*
call void @use2_nocapture(i32* %0, i32* %a)
call void @use2_nocapture(i32* %b, i32* %0)
ret void
}
; If we have a mix of escaping captured/non-captured allocas, ensure that we do
; not do anything including marking callsites with the tail call marker.
;
; rdar://14324281.
define i32* @test8(i32* nocapture %A, i1 %cond) {
; CHECK: i32* @test8
; CHECK-NOT: tailrecurse:
; CHECK-NOT: tail call
; CHECK: ret i32* null
%B = alloca i32
%B2 = alloca i32
br i1 %cond, label %cond_true, label %cond_false
cond_true:
call void @use(i32* %B2)
call i32* @test8(i32* %B, i1 false)
ret i32* null
cond_false:
call void @use2_nocapture(i32* %A, i32* %B)
call void @noarg()
ret i32* null
}
; Don't tail call if a byval arg is captured.
define void @test9(i32* byval %a) {
; CHECK-LABEL: define void @test9(
; CHECK: {{^ *}}call void @use(
call void @use(i32* %a)
ret void
}
%struct.X = type { i8* }
declare void @ctor(%struct.X*)
define void @test10(%struct.X* noalias sret %agg.result, i1 zeroext %b) {
; CHECK-LABEL @test10
entry:
%x = alloca %struct.X, align 8
br i1 %b, label %if.then, label %if.end
if.then: ; preds = %entry
call void @ctor(%struct.X* %agg.result)
; CHECK: tail call void @ctor
br label %return
if.end:
call void @ctor(%struct.X* %x)
; CHECK: call void @ctor
br label %return
return:
ret void
}
declare void @test11_helper1(i8** nocapture, i8*)
declare void @test11_helper2(i8*)
define void @test11() {
; CHECK-LABEL: @test11
; CHECK-NOT: tail
%a = alloca i8*
%b = alloca i8
call void @test11_helper1(i8** %a, i8* %b) ; a = &b
%c = load i8*, i8** %a
call void @test11_helper2(i8* %c)
; CHECK: call void @test11_helper2
ret void
}
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