mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-01 08:23:21 +01:00
35 lines
836 B
LLVM
35 lines
836 B
LLVM
; RUN: opt %s -tailcallelim -S | FileCheck %s
|
|
|
|
define i64 @fib(i64 %n) nounwind readnone {
|
|
; CHECK: @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 @fib(i64 %0) nounwind
|
|
; CHECK: %1 = tail call i64 @fib(i64 %0)
|
|
%2 = add i64 %n, -2
|
|
; CHECK: %2 = add i64 %n.tr, -2
|
|
%3 = tail call i64 @fib(i64 %2) nounwind
|
|
; CHECK-NOT: tail call i64 @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
|
|
}
|