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llvm-project/llvm/test/Transforms/InstSimplify/AndOrXor.ll

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The maximum power of 2 dividing a power of 2 is itself. This occurs in 403.gcc and was spotted by my super-optimizer. llvm-svn: 143054
2011-10-27 04:55:21 +08:00
; RUN: opt < %s -instsimplify -S | FileCheck %s
define i64 @pow2(i32 %x) {
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 $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @pow2(
The maximum power of 2 dividing a power of 2 is itself. This occurs in 403.gcc and was spotted by my super-optimizer. llvm-svn: 143054
2011-10-27 04:55:21 +08:00
%negx = sub i32 0, %x
%x2 = and i32 %x, %negx
%e = zext i32 %x2 to i64
%nege = sub i64 0, %e
%e2 = and i64 %e, %nege
ret i64 %e2
; CHECK: ret i64 %e
}
A shift of a power of two is a power of two or zero. For completeness - not spotted in the wild. llvm-svn: 143211
2011-10-29 02:30:05 +08:00
define i64 @pow2b(i32 %x) {
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$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 llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @pow2b(
A shift of a power of two is a power of two or zero. For completeness - not spotted in the wild. llvm-svn: 143211
2011-10-29 02:30:05 +08:00
%sh = shl i32 2, %x
%e = zext i32 %sh to i64
%nege = sub i64 0, %e
%e2 = and i64 %e, %nege
ret i64 %e2
; CHECK: ret i64 %e
}