8f20e63a20
The recommit includes some changes of testcases. No functional change to the patch.
In RateRegister of existing LSR, if a formula contains a Reg which is a SCEVAddRecExpr,
and this SCEVAddRecExpr's loop is an outerloop, the formula will be marked as Loser
and dropped.
Suppose we have an IR that %for.body is outerloop and %for.body2 is innerloop. LSR only
handle inner loop now so only %for.body2 will be handled.
Using the logic above, formula like
reg(%array) + reg({1,+, %size}<%for.body>) + 1*reg({0,+,1}<%for.body2>) will be dropped
no matter what because reg({1,+, %size}<%for.body>) is a SCEVAddRecExpr type reg related
with outerloop. Only formula like
reg(%array) + 1*reg({{1,+, %size}<%for.body>,+,1}<nuw><nsw><%for.body2>) will be kept
because the SCEVAddRecExpr related with outerloop is folded into the initial value of the
SCEVAddRecExpr related with current loop.
But in some cases, we do need to share the basic induction variable
reg{0 ,+, 1}<%for.body2> among LSR Uses to reduce the final total number of induction
variables used by LSR, so we don't want to drop the formula like
reg(%array) + reg({1,+, %size}<%for.body>) + 1*reg({0,+,1}<%for.body2>) unconditionally.
From the existing comment, it tries to avoid considering multiple level loops at the same time.
However, existing LSR only handles innermost loop, so for any SCEVAddRecExpr with a loop other
than current loop, it is an invariant and will be simple to handle, and the formula doesn't have
to be dropped.
Differential Revision: https://reviews.llvm.org/D26429
llvm-svn: 294814
91 lines
5.0 KiB
LLVM
91 lines
5.0 KiB
LLVM
; REQUIRES: asserts
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; RUN: llc -mtriple=x86_64-apple-darwin -march=x86-64 < %s -o /dev/null -stats -info-output-file - | grep "hoisted out of loops" | grep 5
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; MachineLICM should be able to hoist the symbolic addresses out of
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; the inner loops.
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@main.flags = internal global [8193 x i8] zeroinitializer, align 16 ; <[8193 x i8]*> [#uses=3]
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@.str = private constant [11 x i8] c"Count: %d\0A\00" ; <[11 x i8]*> [#uses=1]
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define i32 @main(i32 %argc, i8** nocapture %argv) nounwind ssp {
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entry:
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%cmp = icmp eq i32 %argc, 2 ; <i1> [#uses=1]
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br i1 %cmp, label %while.cond.preheader, label %bb.nph53
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while.cond.preheader: ; preds = %entry
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%arrayidx = getelementptr inbounds i8*, i8** %argv, i64 1 ; <i8**> [#uses=1]
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%tmp2 = load i8*, i8** %arrayidx ; <i8*> [#uses=1]
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%call = tail call i32 @atoi(i8* %tmp2) nounwind ; <i32> [#uses=2]
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%tobool51 = icmp eq i32 %call, 0 ; <i1> [#uses=1]
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br i1 %tobool51, label %while.end, label %bb.nph53
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while.cond.loopexit: ; preds = %for.inc35
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%indvar.next77 = add i32 %indvar76, 1 ; <i32> [#uses=2]
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%exitcond78 = icmp eq i32 %indvar.next77, %NUM.0.ph80 ; <i1> [#uses=1]
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br i1 %exitcond78, label %while.end, label %bb.nph
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bb.nph53: ; preds = %entry, %while.cond.preheader
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%NUM.0.ph80 = phi i32 [ %call, %while.cond.preheader ], [ 17000, %entry ] ; <i32> [#uses=1]
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br label %bb.nph
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bb.nph: ; preds = %while.cond.loopexit, %bb.nph53
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%indvar76 = phi i32 [ 0, %bb.nph53 ], [ %indvar.next77, %while.cond.loopexit ] ; <i32> [#uses=1]
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br label %for.body
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for.body: ; preds = %for.body, %bb.nph
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%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ] ; <i64> [#uses=2]
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%tmp = add i64 %indvar, 2 ; <i64> [#uses=1]
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%arrayidx10 = getelementptr [8193 x i8], [8193 x i8]* @main.flags, i64 0, i64 %tmp ; <i8*> [#uses=1]
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store i8 1, i8* %arrayidx10
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%indvar.next = add i64 %indvar, 1 ; <i64> [#uses=2]
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%exitcond = icmp eq i64 %indvar.next, 8191 ; <i1> [#uses=1]
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br i1 %exitcond, label %for.body15, label %for.body
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for.body15: ; preds = %for.body, %for.inc35
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%indvar57 = phi i64 [ %indvar.next58, %for.inc35 ], [ 0, %for.body ] ; <i64> [#uses=4]
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%count.248 = phi i32 [ %count.1, %for.inc35 ], [ 0, %for.body ] ; <i32> [#uses=2]
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%tmp68 = add i64 %indvar57, 2 ; <i64> [#uses=2]
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%tmp70 = mul i64 %indvar57, 3 ; <i64> [#uses=1]
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%tmp71 = add i64 %tmp70, 6 ; <i64> [#uses=1]
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%tmp73 = shl i64 %indvar57, 1 ; <i64> [#uses=1]
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%add = add i64 %tmp73, 4 ; <i64> [#uses=2]
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%arrayidx17 = getelementptr [8193 x i8], [8193 x i8]* @main.flags, i64 0, i64 %tmp68 ; <i8*> [#uses=1]
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%tmp18 = load i8, i8* %arrayidx17 ; <i8> [#uses=1]
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%tobool19 = icmp eq i8 %tmp18, 0 ; <i1> [#uses=1]
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br i1 %tobool19, label %for.inc35, label %if.then
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if.then: ; preds = %for.body15
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%cmp2443 = icmp slt i64 %add, 8193 ; <i1> [#uses=1]
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br i1 %cmp2443, label %for.body25, label %for.end32
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for.body25: ; preds = %if.then, %for.body25
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%indvar55 = phi i64 [ %indvar.next56, %for.body25 ], [ 0, %if.then ] ; <i64> [#uses=2]
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%tmp60 = mul i64 %tmp68, %indvar55 ; <i64> [#uses=2]
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%tmp75 = add i64 %add, %tmp60 ; <i64> [#uses=1]
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%arrayidx27 = getelementptr [8193 x i8], [8193 x i8]* @main.flags, i64 0, i64 %tmp75 ; <i8*> [#uses=1]
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store i8 0, i8* %arrayidx27
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%add31 = add i64 %tmp71, %tmp60 ; <i64> [#uses=1]
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%cmp24 = icmp slt i64 %add31, 8193 ; <i1> [#uses=1]
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%indvar.next56 = add i64 %indvar55, 1 ; <i64> [#uses=1]
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br i1 %cmp24, label %for.body25, label %for.end32
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for.end32: ; preds = %for.body25, %if.then
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%inc34 = add nsw i32 %count.248, 1 ; <i32> [#uses=1]
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br label %for.inc35
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for.inc35: ; preds = %for.body15, %for.end32
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%count.1 = phi i32 [ %inc34, %for.end32 ], [ %count.248, %for.body15 ] ; <i32> [#uses=2]
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%indvar.next58 = add i64 %indvar57, 1 ; <i64> [#uses=2]
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%exitcond67 = icmp eq i64 %indvar.next58, 8191 ; <i1> [#uses=1]
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br i1 %exitcond67, label %while.cond.loopexit, label %for.body15
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while.end: ; preds = %while.cond.loopexit, %while.cond.preheader
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%count.0.lcssa = phi i32 [ 0, %while.cond.preheader ], [ %count.1, %while.cond.loopexit ] ; <i32> [#uses=1]
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%call40 = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 %count.0.lcssa) nounwind ; <i32> [#uses=0]
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ret i32 0
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}
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declare i32 @atoi(i8* nocapture) nounwind readonly
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declare i32 @printf(i8* nocapture, ...) nounwind
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