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llvm-project/llvm/test/Transforms/TailCallElim/accum_recursion.ll

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[TailCallElim] Preserve DT and PDT Summary: Previously, in the NewPM pipeline, TailCallElim recalculates the DomTree when it modifies any instruction in the Function. For example, ``` CallInst *CI = dyn_cast<CallInst>(&I); ... CI->setTailCall(); Modified = true; ... if (!Modified || ...) return PreservedAnalyses::all(); ``` After applying this patch, the DomTree only recalculates if needed (plus an extra insertEdge() + an extra deleteEdge() call). When optimizing SQLite with `-passes="default<O3>"` pipeline of the newPM, the number of DomTree recalculation decreases by 6.2%, the number of nodes visited by DFS decreases by 2.9%. The time used by DomTree will decrease approximately 1%~2.5% after applying the patch. Statistics: ``` Before the patch: 23010 dom-tree-stats - Number of DomTree recalculations 489264 dom-tree-stats - Number of nodes visited by DFS -- DomTree After the patch: 21581 dom-tree-stats - Number of DomTree recalculations 475088 dom-tree-stats - Number of nodes visited by DFS -- DomTree ``` Reviewers: kuhar, dmgreen, brzycki, grosser, davide Reviewed By: kuhar, brzycki Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D49982 llvm-svn: 338954
2018-08-04 16:13:47 +08:00
; RUN: opt < %s -tailcallelim -verify-dom-info -S | FileCheck %s
; RUN: opt < %s -passes=tailcallelim -verify-dom-info -S | FileCheck %s
New testcase for automatic insertion of accumulator variables to eliminate tail recursion llvm-svn: 10331
2003-12-09 07:16:25 +08:00
merge two tests and convert to filecheck. llvm-svn: 112613
2010-09-01 02:05:08 +08:00
define i32 @test1_factorial(i32 %x) {
New testcase for automatic insertion of accumulator variables to eliminate tail recursion llvm-svn: 10331
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entry:
Remove llvm-upgrade and update tests. llvm-svn: 48137
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%tmp.1 = icmp sgt i32 %x, 0 ; <i1> [#uses=1]
br i1 %tmp.1, label %then, label %else
then: ; preds = %entry
%tmp.6 = add i32 %x, -1 ; <i32> [#uses=1]
merge two tests and convert to filecheck. llvm-svn: 112613
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%tmp.4 = call i32 @test1_factorial( i32 %tmp.6 ) ; <i32> [#uses=1]
Remove llvm-upgrade and update tests. llvm-svn: 48137
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%tmp.7 = mul i32 %tmp.4, %x ; <i32> [#uses=1]
ret i32 %tmp.7
else: ; preds = %entry
ret i32 1
New testcase for automatic insertion of accumulator variables to eliminate tail recursion llvm-svn: 10331
2003-12-09 07:16:25 +08:00
}
Catch more CHECK that can be converted to CHECK-LABEL in Transforms for easier debugging. No functionality change. This conversion 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/;\(.*\)\([A-Za-z0-9_]*\):\( *\)define\([^@]*\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3define\4@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186269
2013-07-14 09:50:49 +08:00
; CHECK-LABEL: define i32 @test1_factorial(
merge two tests and convert to filecheck. llvm-svn: 112613
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; CHECK: phi i32
; CHECK-NOT: call i32
; CHECK: else:
; This is a more aggressive form of accumulator recursion insertion, which
; requires noticing that X doesn't change as we perform the tailcall.
define i32 @test2_mul(i32 %x, i32 %y) {
entry:
%tmp.1 = icmp eq i32 %y, 0 ; <i1> [#uses=1]
br i1 %tmp.1, label %return, label %endif
endif: ; preds = %entry
%tmp.8 = add i32 %y, -1 ; <i32> [#uses=1]
%tmp.5 = call i32 @test2_mul( i32 %x, i32 %tmp.8 ) ; <i32> [#uses=1]
%tmp.9 = add i32 %tmp.5, %x ; <i32> [#uses=1]
ret i32 %tmp.9
return: ; preds = %entry
ret i32 %x
}
Catch more CHECK that can be converted to CHECK-LABEL in Transforms for easier debugging. No functionality change. This conversion was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$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/;\(.*\)\([A-Za-z0-9_]*\):\( *\)define\([^@]*\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3define\4@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186269
2013-07-14 09:50:49 +08:00
; CHECK-LABEL: define i32 @test2_mul(
merge two tests and convert to filecheck. llvm-svn: 112613
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; CHECK: phi i32
; CHECK-NOT: call i32
merge two tests. llvm-svn: 112617
2010-09-01 02:44:03 +08:00
; CHECK: return:
define i64 @test3_fib(i64 %n) nounwind readnone {
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$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: @test3_fib(
merge two tests. llvm-svn: 112617
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entry:
; CHECK: tailrecurse:
; CHECK: %accumulator.tr = phi i64 [ %n, %entry ], [ %3, %bb1 ]
; CHECK: %n.tr = phi i64 [ %n, %entry ], [ %2, %bb1 ]
switch i64 %n, label %bb1 [
; CHECK: switch i64 %n.tr, label %bb1 [
i64 0, label %bb2
i64 1, label %bb2
]
bb1:
; CHECK: bb1:
%0 = add i64 %n, -1
; CHECK: %0 = add i64 %n.tr, -1
%1 = tail call i64 @test3_fib(i64 %0) nounwind
; CHECK: %1 = tail call i64 @test3_fib(i64 %0)
%2 = add i64 %n, -2
; CHECK: %2 = add i64 %n.tr, -2
%3 = tail call i64 @test3_fib(i64 %2) nounwind
; CHECK-NOT: tail call i64 @test3_fib
%4 = add nsw i64 %3, %1
; CHECK: add nsw i64 %accumulator.tr, %1
ret i64 %4
; CHECK: br label %tailrecurse
bb2:
; CHECK: bb2:
ret i64 %n
; CHECK: ret i64 %accumulator.tr
}