llvm/test/CodeGen/X86/sext-subreg.ll

; RUN: llc < %s -march=x86-64 | FileCheck %s
; rdar://7529457

define i64 @t(i64 %A, i64 %B, i32* %P, i64 *%P2) nounwind {
; CHECK-LABEL: t:
; CHECK: movslq %e{{.*}}, %rax
; CHECK: movq %rax
; CHECK: movl %eax
  %C = add i64 %A, %B
  %D = trunc i64 %C to i32
  store volatile i32 %D, i32* %P
  %E = shl i64 %C, 32
  %F = ashr i64 %E, 32  
  store volatile i64 %F, i64 *%P2
  store volatile i32 %D, i32* %P
  ret i64 undef
}
Add a quick pass to optimize sign / zero extension instructions. For targets where the pre-extension values are available in the subreg of the result of the extension, replace the uses of the pre-extension value with the result + extract_subreg. For now, this pass is fairly conservative. It only perform the replacement when both the pre- and post- extension values are used in the block. It will miss cases where the post-extension values are live, but not used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93278 91177308-0d34-0410-b5e6-96231b3b80d8 2010-01-13 00:30:23 +00:00			`; RUN: llc < %s -march=x86-64 \| FileCheck %s`
			`; rdar://7529457`

			`define i64 @t(i64 %A, i64 %B, i32* %P, i64 *%P2) nounwind {`
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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186280 91177308-0d34-0410-b5e6-96231b3b80d8 2013-07-14 06:24:09 +00:00			`; CHECK-LABEL: t:`
As Dan pointed out, movzbl, movsbl, and friends are nicer than their alias (movzx/movsx) because they give more information. Revert that part of the patch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129498 91177308-0d34-0410-b5e6-96231b3b80d8 2011-04-14 01:46:37 +00:00			`; CHECK: movslq %e{{.*}}, %rax`
Add a quick pass to optimize sign / zero extension instructions. For targets where the pre-extension values are available in the subreg of the result of the extension, replace the uses of the pre-extension value with the result + extract_subreg. For now, this pass is fairly conservative. It only perform the replacement when both the pre- and post- extension values are used in the block. It will miss cases where the post-extension values are live, but not used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93278 91177308-0d34-0410-b5e6-96231b3b80d8 2010-01-13 00:30:23 +00:00			`; CHECK: movq %rax`
			`; CHECK: movl %eax`
			`%C = add i64 %A, %B`
			`%D = trunc i64 %C to i32`
Upgrade syntax of tests using volatile instructions to use 'load volatile' instead of 'volatile load', which is archaic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145171 91177308-0d34-0410-b5e6-96231b3b80d8 2011-11-27 06:54:59 +00:00			`store volatile i32 %D, i32* %P`
Add a quick pass to optimize sign / zero extension instructions. For targets where the pre-extension values are available in the subreg of the result of the extension, replace the uses of the pre-extension value with the result + extract_subreg. For now, this pass is fairly conservative. It only perform the replacement when both the pre- and post- extension values are used in the block. It will miss cases where the post-extension values are live, but not used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93278 91177308-0d34-0410-b5e6-96231b3b80d8 2010-01-13 00:30:23 +00:00			`%E = shl i64 %C, 32`
			`%F = ashr i64 %E, 32`
Upgrade syntax of tests using volatile instructions to use 'load volatile' instead of 'volatile load', which is archaic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145171 91177308-0d34-0410-b5e6-96231b3b80d8 2011-11-27 06:54:59 +00:00			`store volatile i64 %F, i64 *%P2`
			`store volatile i32 %D, i32* %P`
Add a quick pass to optimize sign / zero extension instructions. For targets where the pre-extension values are available in the subreg of the result of the extension, replace the uses of the pre-extension value with the result + extract_subreg. For now, this pass is fairly conservative. It only perform the replacement when both the pre- and post- extension values are used in the block. It will miss cases where the post-extension values are live, but not used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93278 91177308-0d34-0410-b5e6-96231b3b80d8 2010-01-13 00:30:23 +00:00			`ret i64 undef`
			`}`