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llvm-6502/test/Transforms/InstSimplify/rem.ll

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Move some rem transforms out of instcombine and into instsimplify. This automagically provides a transform noticed by my super-optimizer as occurring quite often: "rem x, (select cond, x, 1)" -> 0. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130694 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-02 16:27:02 +00:00
; RUN: opt < %s -instsimplify -S | FileCheck %s
define i32 @select1(i32 %x, i1 %b) {
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 $NAME fi done git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186268 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-14 01:42:54 +00:00
; CHECK-LABEL: @select1(
Move some rem transforms out of instcombine and into instsimplify. This automagically provides a transform noticed by my super-optimizer as occurring quite often: "rem x, (select cond, x, 1)" -> 0. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130694 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-02 16:27:02 +00:00
%rhs = select i1 %b, i32 %x, i32 1
%rem = srem i32 %x, %rhs
ret i32 %rem
; CHECK: ret i32 0
}
define i32 @select2(i32 %x, i1 %b) {
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$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
; CHECK-LABEL: @select2(
Move some rem transforms out of instcombine and into instsimplify. This automagically provides a transform noticed by my super-optimizer as occurring quite often: "rem x, (select cond, x, 1)" -> 0. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130694 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-02 16:27:02 +00:00
%rhs = select i1 %b, i32 %x, i32 1
%rem = urem i32 %x, %rhs
ret i32 %rem
; CHECK: ret i32 0
}
InstSimplify: ((X % Y) % Y) -> (X % Y) Patch by Sonam Kumari! Differential Revision: http://reviews.llvm.org/D5350 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217937 91177308-0d34-0410-b5e6-96231b3b80d8
2014-09-17 03:34:34 +00:00
InstSimplify: Don't allow (x srem y) urem y -> x srem y Let's consider the case where: %x i16 = 32768 %y i16 = 384 %x srem %y = 65408 (%x srem %y) urem %y = 128 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217939 91177308-0d34-0410-b5e6-96231b3b80d8
2014-09-17 04:16:35 +00:00
define i32 @rem1(i32 %x, i32 %n) {
; CHECK-LABEL: @rem1(
InstSimplify: ((X % Y) % Y) -> (X % Y) Patch by Sonam Kumari! Differential Revision: http://reviews.llvm.org/D5350 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217937 91177308-0d34-0410-b5e6-96231b3b80d8
2014-09-17 03:34:34 +00:00
; CHECK-NEXT: %mod = srem i32 %x, %n
; CHECK-NEXT: ret i32 %mod
%mod = srem i32 %x, %n
%mod1 = srem i32 %mod, %n
ret i32 %mod1
}
InstSimplify: Don't allow (x srem y) urem y -> x srem y Let's consider the case where: %x i16 = 32768 %y i16 = 384 %x srem %y = 65408 (%x srem %y) urem %y = 128 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217939 91177308-0d34-0410-b5e6-96231b3b80d8
2014-09-17 04:16:35 +00:00
define i32 @rem2(i32 %x, i32 %n) {
; CHECK-LABEL: @rem2(
; CHECK-NEXT: %mod = urem i32 %x, %n
; CHECK-NEXT: ret i32 %mod
%mod = urem i32 %x, %n
%mod1 = urem i32 %mod, %n
ret i32 %mod1
}
define i32 @rem3(i32 %x, i32 %n) {
; CHECK-LABEL: @rem3(
; CHECK-NEXT: %[[srem:.*]] = srem i32 %x, %n
; CHECK-NEXT: %[[urem:.*]] = urem i32 %[[srem]], %n
; CHECK-NEXT: ret i32 %[[urem]]
%mod = srem i32 %x, %n
%mod1 = urem i32 %mod, %n
ret i32 %mod1
}
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