llvm-6502/test/Transforms/SCCP/sccptest.ll
Stephen Lin 39f4e8d9cc Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change.
This update was done with the following bash script:

  find test/Transforms -name "*.ll" | \
  while read NAME; do
    echo "$NAME"
    if ! grep -q "^; *RUN: *llc" $NAME; then
      TEMP=`mktemp -t temp`
      cp $NAME $TEMP
      sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \
      while read FUNC; do
        sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP
      done
      mv $TEMP $NAME
    fi
  done


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186268 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-14 01:42:54 +00:00

59 lines
1.3 KiB
LLVM

; RUN: opt < %s -sccp -S | FileCheck %s
; This is a basic sanity check for constant propagation. The add instruction
; should be eliminated.
define i32 @test1(i1 %B) {
br i1 %B, label %BB1, label %BB2
BB1: ; preds = %0
%Val = add i32 0, 0 ; <i32> [#uses=1]
br label %BB3
BB2: ; preds = %0
br label %BB3
BB3: ; preds = %BB2, %BB1
%Ret = phi i32 [ %Val, %BB1 ], [ 1, %BB2 ] ; <i32> [#uses=1]
ret i32 %Ret
; CHECK-LABEL: @test1(
; CHECK: %Ret = phi i32 [ 0, %BB1 ], [ 1, %BB2 ]
}
; This is the test case taken from appel's book that illustrates a hard case
; that SCCP gets right.
;
define i32 @test2(i32 %i0, i32 %j0) {
; CHECK-LABEL: @test2(
BB1:
br label %BB2
BB2:
%j2 = phi i32 [ %j4, %BB7 ], [ 1, %BB1 ]
%k2 = phi i32 [ %k4, %BB7 ], [ 0, %BB1 ]
%kcond = icmp slt i32 %k2, 100
br i1 %kcond, label %BB3, label %BB4
BB3:
%jcond = icmp slt i32 %j2, 20
br i1 %jcond, label %BB5, label %BB6
; CHECK: BB3:
; CHECK-NEXT: br i1 true, label %BB5, label %BB6
BB4:
ret i32 %j2
; CHECK: BB4:
; CHECK-NEXT: ret i32 1
BB5:
%k3 = add i32 %k2, 1
br label %BB7
BB6:
%k5 = add i32 %k2, 1
br label %BB7
; CHECK: BB6:
; CHECK-NEXT: br label %BB7
BB7:
%j4 = phi i32 [ 1, %BB5 ], [ %k2, %BB6 ]
%k4 = phi i32 [ %k3, %BB5 ], [ %k5, %BB6 ]
br label %BB2
; CHECK: BB7:
; CHECK-NEXT: %k4 = phi i32 [ %k3, %BB5 ], [ undef, %BB6 ]
; CHECK-NEXT: br label %BB2
}