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llvm-mirror/test/CodeGen/ARM/2012-03-26-FoldImmBug.ll
Stephen Lin 7e501cf4c3 Mass update to CodeGen tests to use CHECK-LABEL for labels corresponding to function definitions for more informative error messages. No functionality change and all updated tests passed locally.
This update was done with the following bash script:

  find test/CodeGen -name "*.ll" | \
  while read NAME; do
    echo "$NAME"
    if ! grep -q "^; *RUN: *llc.*debug" $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
      sed -i '' "s/;\(.*\)-LABEL-LABEL:/;\1-LABEL:/" $TEMP
      sed -i '' "s/;\(.*\)-NEXT-LABEL:/;\1-NEXT:/" $TEMP
      sed -i '' "s/;\(.*\)-NOT-LABEL:/;\1-NOT:/" $TEMP
      sed -i '' "s/;\(.*\)-DAG-LABEL:/;\1-DAG:/" $TEMP
      mv $TEMP $NAME
    fi
  done

llvm-svn: 186280
2013-07-14 06:24:09 +00:00

34 lines
1.1 KiB
LLVM

; RUN: llc < %s -mtriple=thumbv7-apple-ios -mcpu=cortex-a8 | FileCheck %s
; ARM has a peephole optimization which looks for a def / use pair. The def
; produces a 32-bit immediate which is consumed by the use. It tries to
; fold the immediate by breaking it into two parts and fold them into the
; immmediate fields of two uses. e.g
; movw r2, #40885
; movt r3, #46540
; add r0, r0, r3
; =>
; add.w r0, r0, #3019898880
; add.w r0, r0, #30146560
;
; However, this transformation is incorrect if the user produces a flag. e.g.
; movw r2, #40885
; movt r3, #46540
; adds r0, r0, r3
; =>
; add.w r0, r0, #3019898880
; adds.w r0, r0, #30146560
; Note the adds.w may not set the carry flag even if the original sequence
; would.
;
; rdar://11116189
define i64 @t(i64 %aInput) nounwind {
; CHECK-LABEL: t:
; CHECK: movs [[REG:(r[0-9]+)]], #0
; CHECK: movt [[REG]], #46540
; CHECK: adds r{{[0-9]+}}, r{{[0-9]+}}, [[REG]]
%1 = mul i64 %aInput, 1000000
%2 = add i64 %1, -7952618389194932224
ret i64 %2
}