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; The inliner should never inline recursive functions into other functions.
; This effectively is just peeling off the first iteration of a loop, and the
; inliner heuristics are not set up for this.
; RUN: opt -inline -S < %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin10.3"
@g = common global i32 0 ; <i32*> [#uses=1]
define internal void @foo(i32 %x) nounwind ssp {
entry:
%0 = icmp slt i32 %x, 0 ; <i1> [#uses=1]
br i1 %0, label %return, label %bb
bb: ; preds = %entry
%1 = sub nsw i32 %x, 1 ; <i32> [#uses=1]
call void @foo(i32 %1) nounwind ssp
store volatile i32 1, i32* @g, align 4
ret void
return: ; preds = %entry
ret void
}
;; CHECK: @bonk
;; CHECK: call void @foo(i32 42)
define void @bonk() nounwind ssp {
entry:
call void @foo(i32 42) nounwind ssp
ret void
}
;; Here is an indirect case that should not be infinitely inlined.
define internal void @f1(i32 %x, i8* %Foo, i8* %Bar) nounwind ssp {
entry:
%0 = bitcast i8* %Bar to void (i32, i8*, i8*)*
%1 = sub nsw i32 %x, 1
call void %0(i32 %1, i8* %Foo, i8* %Bar) nounwind
store volatile i32 42, i32* @g, align 4
ret void
}
define internal void @f2(i32 %x, i8* %Foo, i8* %Bar) nounwind ssp {
entry:
%0 = icmp slt i32 %x, 0 ; <i1> [#uses=1]
br i1 %0, label %return, label %bb
bb: ; preds = %entry
%1 = bitcast i8* %Foo to void (i32, i8*, i8*)* ; <void (i32, i8*, i8*)*> [#uses=1]
call void %1(i32 %x, i8* %Foo, i8* %Bar) nounwind
store volatile i32 13, i32* @g, align 4
ret void
return: ; preds = %entry
ret void
}
; CHECK: @top_level
; CHECK: call void @f2(i32 122
; Here we inline one instance of the cycle, but we don't want to completely
; unroll it.
define void @top_level() nounwind ssp {
entry:
call void @f2(i32 123, i8* bitcast (void (i32, i8*, i8*)* @f1 to i8*), i8* bitcast (void (i32, i8*, i8*)* @f2 to i8*)) nounwind ssp
ret void
}
; Check that a recursive function, when called with a constant that makes the
; recursive path dead code can actually be inlined.
define i32 @fib(i32 %i) {
entry:
%is.zero = icmp eq i32 %i, 0
br i1 %is.zero, label %zero.then, label %zero.else
zero.then:
ret i32 0
zero.else:
%is.one = icmp eq i32 %i, 1
br i1 %is.one, label %one.then, label %one.else
one.then:
ret i32 1
one.else:
%i1 = sub i32 %i, 1
%f1 = call i32 @fib(i32 %i1)
%i2 = sub i32 %i, 2
%f2 = call i32 @fib(i32 %i2)
%f = add i32 %f1, %f2
ret i32 %f
}
define i32 @fib_caller() {
; CHECK: @fib_caller
; CHECK-NOT: call
; CHECK: ret
%f1 = call i32 @fib(i32 0)
%f2 = call i32 @fib(i32 1)
%result = add i32 %f1, %f2
ret i32 %result
}
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