forked from OSchip/llvm-project
242 lines
6.3 KiB
LLVM
242 lines
6.3 KiB
LLVM
; RUN: opt < %s -tailcallelim -verify-dom-info -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
|
|
}
|
|
|
|
; PR25928
|
|
define void @test12() {
|
|
entry:
|
|
; CHECK-LABEL: @test12
|
|
; CHECK: {{^ *}} call void undef(i8* undef) [ "foo"(i8* %e) ]
|
|
%e = alloca i8
|
|
call void undef(i8* undef) [ "foo"(i8* %e) ]
|
|
unreachable
|
|
}
|
|
|
|
%struct.foo = type { [10 x i32] }
|
|
|
|
; If an alloca is passed byval it is not a use of the alloca or an escape
|
|
; point, and both calls below can be marked tail.
|
|
define void @test13() {
|
|
; CHECK-LABEL: @test13
|
|
; CHECK: tail call void @bar(%struct.foo* byval %f)
|
|
; CHECK: tail call void @bar(%struct.foo* null)
|
|
entry:
|
|
%f = alloca %struct.foo
|
|
call void @bar(%struct.foo* byval %f)
|
|
call void @bar(%struct.foo* null)
|
|
ret void
|
|
}
|
|
|
|
; A call which passes a byval parameter using byval can be marked tail.
|
|
define void @test14(%struct.foo* byval %f) {
|
|
; CHECK-LABEL: @test14
|
|
; CHECK: tail call void @bar
|
|
entry:
|
|
call void @bar(%struct.foo* byval %f)
|
|
ret void
|
|
}
|
|
|
|
; If a byval parameter is copied into an alloca and passed byval the call can
|
|
; be marked tail.
|
|
define void @test15(%struct.foo* byval %f) {
|
|
; CHECK-LABEL: @test15
|
|
; CHECK: tail call void @bar
|
|
entry:
|
|
%agg.tmp = alloca %struct.foo
|
|
%0 = bitcast %struct.foo* %agg.tmp to i8*
|
|
%1 = bitcast %struct.foo* %f to i8*
|
|
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %1, i64 40, i1 false)
|
|
call void @bar(%struct.foo* byval %agg.tmp)
|
|
ret void
|
|
}
|
|
|
|
declare void @bar(%struct.foo* byval)
|
|
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1)
|