llvm-6502/test/Transforms/SCCP/sccptest.ll
2002-05-22 15:49:14 +00:00

40 lines
762 B
LLVM

; This is the test case taken from appel's book that illustrates a hard case
; that SCCP gets right. BB3 should be completely eliminated.
;
; RUN: if as < %s | opt -sccp -constprop -dce -cfgsimplify | dis | grep BB3
; RUN: then exit 1
; RUN: else exit 0
; RUN: fi
int "test function"(int %i0, int %j0)
begin
BB1:
br label %BB2
BB2:
%j2 = phi int [%j4, %BB7], [1, %BB1]
%k2 = phi int [%k4, %BB7], [0, %BB1]
%kcond = setlt int %k2, 100
br bool %kcond, label %BB3, label %BB4
BB3:
%jcond = setlt int %j2, 20
br bool %jcond, label %BB5, label %BB6
BB4:
ret int %j2
BB5:
%k3 = add int %k2, 1
br label %BB7
BB6:
%k5 = add int %k2, 1
br label %BB7
BB7:
%j4 = phi int [1, %BB5], [%k2, %BB6]
%k4 = phi int [%k3, %BB5], [%k5, %BB6]
br label %BB2
end