llvm-mirror/test/Transforms/InstSimplify/2011-01-14-Thread.ll

; RUN: opt < %s -instsimplify -S | FileCheck %s

define i32 @shift_select(i1 %cond) {
; CHECK-LABEL: @shift_select(
  %s = select i1 %cond, i32 0, i32 1
  %r = lshr i32 %s, 1
  ret i32 %r
; CHECK: ret i32 0
}
Factorize common code out of the InstructionSimplify shift logic. Add in threading of shifts over selects and phis while there. This fires here and there in the testsuite, to not much effect. For example when compiling spirit it fires 5 times, during early-cse, resulting in 6 more cse simplifications, and 3 more terminators being folded by jump threading, but the final bitcode doesn't change in any interesting way: other optimizations would have caught the opportunity anyway, only later. llvm-svn: 123441 2011-01-14 15:44:12 +01:00			`; RUN: opt < %s -instsimplify -S \| FileCheck %s`

			`define i32 @shift_select(i1 %cond) {`
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 03:42:54 +02:00			`; CHECK-LABEL: @shift_select(`
Factorize common code out of the InstructionSimplify shift logic. Add in threading of shifts over selects and phis while there. This fires here and there in the testsuite, to not much effect. For example when compiling spirit it fires 5 times, during early-cse, resulting in 6 more cse simplifications, and 3 more terminators being folded by jump threading, but the final bitcode doesn't change in any interesting way: other optimizations would have caught the opportunity anyway, only later. llvm-svn: 123441 2011-01-14 15:44:12 +01:00			`%s = select i1 %cond, i32 0, i32 1`
			`%r = lshr i32 %s, 1`
			`ret i32 %r`
			`; CHECK: ret i32 0`
			`}`