2010-08-31 20:05:08 +02:00
|
|
|
; RUN: opt < %s -tailcallelim -S | FileCheck %s
|
2003-12-09 00:16:25 +01:00
|
|
|
|
2010-08-31 20:05:08 +02:00
|
|
|
define i32 @test1_factorial(i32 %x) {
|
2003-12-09 00:16:25 +01:00
|
|
|
entry:
|
2008-03-10 08:21:50 +01:00
|
|
|
%tmp.1 = icmp sgt i32 %x, 0 ; <i1> [#uses=1]
|
|
|
|
|
br i1 %tmp.1, label %then, label %else
|
|
|
|
|
then: ; preds = %entry
|
|
|
|
|
%tmp.6 = add i32 %x, -1 ; <i32> [#uses=1]
|
2010-08-31 20:05:08 +02:00
|
|
|
%tmp.4 = call i32 @test1_factorial( i32 %tmp.6 ) ; <i32> [#uses=1]
|
2008-03-10 08:21:50 +01:00
|
|
|
%tmp.7 = mul i32 %tmp.4, %x ; <i32> [#uses=1]
|
|
|
|
|
ret i32 %tmp.7
|
|
|
|
|
else: ; preds = %entry
|
|
|
|
|
ret i32 1
|
2003-12-09 00:16:25 +01:00
|
|
|
}
|
|
|
|
|
|
2010-08-31 20:05:08 +02:00
|
|
|
; CHECK: define i32 @test1_factorial
|
|
|
|
|
; CHECK: phi i32
|
|
|
|
|
; CHECK-NOT: call i32
|
|
|
|
|
; CHECK: else:
|
|
|
|
|
|
|
|
|
|
; This is a more aggressive form of accumulator recursion insertion, which
|
|
|
|
|
; requires noticing that X doesn't change as we perform the tailcall.
|
|
|
|
|
|
|
|
|
|
define i32 @test2_mul(i32 %x, i32 %y) {
|
|
|
|
|
entry:
|
|
|
|
|
%tmp.1 = icmp eq i32 %y, 0 ; <i1> [#uses=1]
|
|
|
|
|
br i1 %tmp.1, label %return, label %endif
|
|
|
|
|
endif: ; preds = %entry
|
|
|
|
|
%tmp.8 = add i32 %y, -1 ; <i32> [#uses=1]
|
|
|
|
|
%tmp.5 = call i32 @test2_mul( i32 %x, i32 %tmp.8 ) ; <i32> [#uses=1]
|
|
|
|
|
%tmp.9 = add i32 %tmp.5, %x ; <i32> [#uses=1]
|
|
|
|
|
ret i32 %tmp.9
|
|
|
|
|
return: ; preds = %entry
|
|
|
|
|
ret i32 %x
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
; CHECK: define i32 @test2_mul
|
|
|
|
|
; CHECK: phi i32
|
|
|
|
|
; CHECK-NOT: call i32
|
2010-08-31 20:44:03 +02:00
|
|
|
; CHECK: return:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
define i64 @test3_fib(i64 %n) nounwind readnone {
|
|
|
|
|
; CHECK: @test3_fib
|
|
|
|
|
entry:
|
|
|
|
|
; CHECK: tailrecurse:
|
|
|
|
|
; CHECK: %accumulator.tr = phi i64 [ %n, %entry ], [ %3, %bb1 ]
|
|
|
|
|
; CHECK: %n.tr = phi i64 [ %n, %entry ], [ %2, %bb1 ]
|
|
|
|
|
switch i64 %n, label %bb1 [
|
|
|
|
|
; CHECK: switch i64 %n.tr, label %bb1 [
|
|
|
|
|
i64 0, label %bb2
|
|
|
|
|
i64 1, label %bb2
|
|
|
|
|
]
|
|
|
|
|
|
|
|
|
|
bb1:
|
|
|
|
|
; CHECK: bb1:
|
|
|
|
|
%0 = add i64 %n, -1
|
|
|
|
|
; CHECK: %0 = add i64 %n.tr, -1
|
|
|
|
|
%1 = tail call i64 @test3_fib(i64 %0) nounwind
|
|
|
|
|
; CHECK: %1 = tail call i64 @test3_fib(i64 %0)
|
|
|
|
|
%2 = add i64 %n, -2
|
|
|
|
|
; CHECK: %2 = add i64 %n.tr, -2
|
|
|
|
|
%3 = tail call i64 @test3_fib(i64 %2) nounwind
|
|
|
|
|
; CHECK-NOT: tail call i64 @test3_fib
|
|
|
|
|
%4 = add nsw i64 %3, %1
|
|
|
|
|
; CHECK: add nsw i64 %accumulator.tr, %1
|
|
|
|
|
ret i64 %4
|
|
|
|
|
; CHECK: br label %tailrecurse
|
|
|
|
|
|
|
|
|
|
bb2:
|
|
|
|
|
; CHECK: bb2:
|
|
|
|
|
ret i64 %n
|
|
|
|
|
; CHECK: ret i64 %accumulator.tr
|
|
|
|
|
}
|
