mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 11:42:57 +01:00
37 lines
1.3 KiB
LLVM
37 lines
1.3 KiB
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: opt < %s -sccp -simplifycfg -indvars -loop-deletion -dce -simplifycfg -S | not grep br
|
|
|
|
define i32 @"test function"(i32 %i0, i32 %j0) {
|
|
BB1:
|
|
br label %BB2
|
|
|
|
BB2: ; preds = %BB7, %BB1
|
|
%j2 = phi i32 [ %j4, %BB7 ], [ 1, %BB1 ] ; <i32> [#uses=2]
|
|
%k2 = phi i32 [ %k4, %BB7 ], [ 0, %BB1 ] ; <i32> [#uses=4]
|
|
%kcond = icmp slt i32 %k2, 100 ; <i1> [#uses=1]
|
|
br i1 %kcond, label %BB3, label %BB4
|
|
|
|
BB3: ; preds = %BB2
|
|
%jcond = icmp slt i32 %j2, 20 ; <i1> [#uses=1]
|
|
br i1 %jcond, label %BB5, label %BB6
|
|
|
|
BB4: ; preds = %BB2
|
|
ret i32 %j2
|
|
|
|
BB5: ; preds = %BB3
|
|
%k3 = add i32 %k2, 1 ; <i32> [#uses=1]
|
|
br label %BB7
|
|
|
|
BB6: ; preds = %BB3
|
|
%k5 = add i32 %k2, 1 ; <i32> [#uses=1]
|
|
br label %BB7
|
|
|
|
BB7: ; preds = %BB6, %BB5
|
|
%j4 = phi i32 [ 1, %BB5 ], [ %k2, %BB6 ] ; <i32> [#uses=1]
|
|
%k4 = phi i32 [ %k3, %BB5 ], [ %k5, %BB6 ] ; <i32> [#uses=1]
|
|
br label %BB2
|
|
}
|
|
|