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llvm-mirror/test/CodeGen/X86/shl_elim.ll

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X86: Shrink certain forms of movsx. In particular: movsbw %al, %ax --> cbtw movswl %ax, %eax --> cwtl movslq %eax, %rax --> cltq According to Intel's manual those have the same performance characteristics but come with a smaller encoding. llvm-svn: 186174
2013-07-12 20:06:44 +02:00
; RUN: llc < %s -march=x86 | FileCheck %s
new testcase llvm-svn: 36243
2007-04-18 05:04:37 +02:00
Update tests. llvm-svn: 102487
2010-04-28 03:53:13 +02:00
define i32 @test1(i64 %a) nounwind {
new testcase llvm-svn: 36243
2007-04-18 05:04:37 +02:00
%tmp29 = lshr i64 %a, 24 ; <i64> [#uses=1]
%tmp23 = trunc i64 %tmp29 to i32 ; <i32> [#uses=1]
%tmp410 = lshr i32 %tmp23, 9 ; <i32> [#uses=1]
%tmp45 = trunc i32 %tmp410 to i16 ; <i16> [#uses=1]
%tmp456 = sext i16 %tmp45 to i32 ; <i32> [#uses=1]
ret i32 %tmp456
X86: Shrink certain forms of movsx. In particular: movsbw %al, %ax --> cbtw movswl %ax, %eax --> cwtl movslq %eax, %rax --> cltq According to Intel's manual those have the same performance characteristics but come with a smaller encoding. llvm-svn: 186174
2013-07-12 20:06:44 +02:00
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 08:24:09 +02:00
; CHECK-LABEL: test1:
X86: Shrink certain forms of movsx. In particular: movsbw %al, %ax --> cbtw movswl %ax, %eax --> cwtl movslq %eax, %rax --> cltq According to Intel's manual those have the same performance characteristics but come with a smaller encoding. llvm-svn: 186174
2013-07-12 20:06:44 +02:00
; CHECK: movl 8(%esp), %eax
; CHECK: shrl %eax
; CHECK: cwtl
new testcase llvm-svn: 36243
2007-04-18 05:04:37 +02:00
}
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