Imported Upstream version 5.18.0.234

Former-commit-id: 8071ec1a8c5eaa9be24b41745add19297608001f

external/llvm/test/Transforms/TailCallElim/accum_recursion.ll

@@ -1,75 +0,0 @@
-; RUN: opt < %s -tailcallelim -S | FileCheck %s
-; RUN: opt < %s -passes=tailcallelim -S | FileCheck %s
-
-define i32 @test1_factorial(i32 %x) {
-entry:
-	%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]
-	%tmp.4 = call i32 @test1_factorial( i32 %tmp.6 )		; <i32> [#uses=1]
-	%tmp.7 = mul i32 %tmp.4, %x		; <i32> [#uses=1]
-	ret i32 %tmp.7
-else:		; preds = %entry
-	ret i32 1
-}
-
-; CHECK-LABEL: 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-LABEL: define i32 @test2_mul(
-; CHECK: phi i32
-; CHECK-NOT: call i32
-; CHECK: return:
-
-
-define i64 @test3_fib(i64 %n) nounwind readnone {
-; CHECK-LABEL: @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
-}