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llvm-6502/test/Transforms/EarlyCSE/basic.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

122 lines
2.6 KiB
LLVM

; RUN: opt < %s -S -early-cse | FileCheck %s
; CHECK-LABEL: @test1(
define void @test1(i8 %V, i32 *%P) {
%A = bitcast i64 42 to double ;; dead
%B = add i32 4, 19 ;; constant folds
store i32 %B, i32* %P
; CHECK-NEXT: store i32 23, i32* %P
%C = zext i8 %V to i32
%D = zext i8 %V to i32 ;; CSE
store volatile i32 %C, i32* %P
store volatile i32 %D, i32* %P
; CHECK-NEXT: %C = zext i8 %V to i32
; CHECK-NEXT: store volatile i32 %C
; CHECK-NEXT: store volatile i32 %C
%E = add i32 %C, %C
%F = add i32 %C, %C
store volatile i32 %E, i32* %P
store volatile i32 %F, i32* %P
; CHECK-NEXT: %E = add i32 %C, %C
; CHECK-NEXT: store volatile i32 %E
; CHECK-NEXT: store volatile i32 %E
%G = add nuw i32 %C, %C ;; not a CSE with E
store volatile i32 %G, i32* %P
; CHECK-NEXT: %G = add nuw i32 %C, %C
; CHECK-NEXT: store volatile i32 %G
ret void
}
;; Simple load value numbering.
; CHECK-LABEL: @test2(
define i32 @test2(i32 *%P) {
%V1 = load i32* %P
%V2 = load i32* %P
%Diff = sub i32 %V1, %V2
ret i32 %Diff
; CHECK: ret i32 0
}
;; Cross block load value numbering.
; CHECK-LABEL: @test3(
define i32 @test3(i32 *%P, i1 %Cond) {
%V1 = load i32* %P
br i1 %Cond, label %T, label %F
T:
store i32 4, i32* %P
ret i32 42
F:
%V2 = load i32* %P
%Diff = sub i32 %V1, %V2
ret i32 %Diff
; CHECK: F:
; CHECK: ret i32 0
}
;; Cross block load value numbering stops when stores happen.
; CHECK-LABEL: @test4(
define i32 @test4(i32 *%P, i1 %Cond) {
%V1 = load i32* %P
br i1 %Cond, label %T, label %F
T:
ret i32 42
F:
; Clobbers V1
store i32 42, i32* %P
%V2 = load i32* %P
%Diff = sub i32 %V1, %V2
ret i32 %Diff
; CHECK: F:
; CHECK: ret i32 %Diff
}
declare i32 @func(i32 *%P) readonly
;; Simple call CSE'ing.
; CHECK-LABEL: @test5(
define i32 @test5(i32 *%P) {
%V1 = call i32 @func(i32* %P)
%V2 = call i32 @func(i32* %P)
%Diff = sub i32 %V1, %V2
ret i32 %Diff
; CHECK: ret i32 0
}
;; Trivial Store->load forwarding
; CHECK-LABEL: @test6(
define i32 @test6(i32 *%P) {
store i32 42, i32* %P
%V1 = load i32* %P
ret i32 %V1
; CHECK: ret i32 42
}
;; Trivial dead store elimination.
; CHECK-LABEL: @test7(
define void @test7(i32 *%P) {
store i32 42, i32* %P
store i32 45, i32* %P
ret void
; CHECK-NEXT: store i32 45
; CHECK-NEXT: ret void
}
;; Readnone functions aren't invalidated by stores.
; CHECK-LABEL: @test8(
define i32 @test8(i32 *%P) {
%V1 = call i32 @func(i32* %P) readnone
store i32 4, i32* %P
%V2 = call i32 @func(i32* %P) readnone
%Diff = sub i32 %V1, %V2
ret i32 %Diff
; CHECK: ret i32 0
}