mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-21 03:32:21 +00:00
38 lines
746 B
LLVM
38 lines
746 B
LLVM
|
; This is the test case taken from Appel's book that illustrates a hard case
|
||
|
|
; that SCCP gets right, and when followed by ADCE, is completely eliminated
|
||
|
|
;
|
||
|
|
; RUN: if as < %s | opt -sccp -adce | dis | grep br
|
||
|
|
; RUN: then exit 1
|
||
|
|
; RUN: else exit 0
|
||
|
|
; RUN: fi
|
||
|
|
|
||
|
|
int "test function"(int %i0, int %j0) {
|
||
|
|
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
|
||
|
|
}
|