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llvm-project/llvm/test/Transforms/GVN/non-local-offset.ll

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Enhance GVN to do more precise alias queries for non-local memory references. For example, this allows gvn to eliminate the load in this example: void foo(int n, int* p, int *q) { p[0] = 0; p[1] = 1; if (n) { *q = p[0]; } } llvm-svn: 118714
2010-11-11 04:37:15 +08:00
; RUN: opt -basicaa -gvn -S < %s | FileCheck %s
target datalayout = "e-p:64:64:64"
; GVN should ignore the store to p[1] to see that the load from p[0] is
; fully redundant.
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 $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @yes(
Enhance GVN to do more precise alias queries for non-local memory references. For example, this allows gvn to eliminate the load in this example: void foo(int n, int* p, int *q) { p[0] = 0; p[1] = 1; if (n) { *q = p[0]; } } llvm-svn: 118714
2010-11-11 04:37:15 +08:00
; CHECK: if.then:
; CHECK-NEXT: store i32 0, i32* %q
; CHECK-NEXT: ret void
define void @yes(i1 %c, i32* %p, i32* %q) nounwind {
entry:
store i32 0, i32* %p
%p1 = getelementptr inbounds i32* %p, i64 1
store i32 1, i32* %p1
br i1 %c, label %if.else, label %if.then
if.then:
%t = load i32* %p
store i32 %t, i32* %q
ret void
if.else:
ret void
}
; GVN should ignore the store to p[1] to see that the first load from p[0] is
; fully redundant. However, the second load is larger, so it's not a simple
; redundancy.
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$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 09:42:54 +08:00
; CHECK-LABEL: @watch_out_for_size_change(
Enhance GVN to do more precise alias queries for non-local memory references. For example, this allows gvn to eliminate the load in this example: void foo(int n, int* p, int *q) { p[0] = 0; p[1] = 1; if (n) { *q = p[0]; } } llvm-svn: 118714
2010-11-11 04:37:15 +08:00
; CHECK: if.then:
; CHECK-NEXT: store i32 0, i32* %q
; CHECK-NEXT: ret void
; CHECK: if.else:
; CHECK: load i64* %pc
; CHECK: store i64
define void @watch_out_for_size_change(i1 %c, i32* %p, i32* %q) nounwind {
entry:
store i32 0, i32* %p
%p1 = getelementptr inbounds i32* %p, i64 1
store i32 1, i32* %p1
br i1 %c, label %if.else, label %if.then
if.then:
%t = load i32* %p
store i32 %t, i32* %q
ret void
if.else:
%pc = bitcast i32* %p to i64*
%qc = bitcast i32* %q to i64*
%t64 = load i64* %pc
store i64 %t64, i64* %qc
ret void
}