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llvm-project/llvm/test/Transforms/LoopStrengthReduce/2012-01-02-nopreheader.ll

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Fix SCEVExpander to handle loops with no preheader when LSR gives it a "phony" insertion point. Fixes rdar://10619599: "SelectionDAGBuilder shouldn't visit PHI nodes!" assert llvm-svn: 147439
2012-01-03 05:25:10 +08:00
; RUN: opt -loop-reduce -S < %s | FileCheck %s
;
; <rdar://10619599> "SelectionDAGBuilder shouldn't visit PHI nodes!" assert.
LSR: Don't optimize loops if an outer loop has no preheader. LoopSimplify may not run on some outer loops, e.g. because of indirect branches. SCEVExpander simply cannot handle outer loops with no preheaders. Fixes rdar://10655343 SCEVExpander segfault. llvm-svn: 147718
2012-01-07 11:16:50 +08:00
; <rdar://10655343> SCEVExpander segfault on simple test case
Fix SCEVExpander to handle loops with no preheader when LSR gives it a "phony" insertion point. Fixes rdar://10619599: "SelectionDAGBuilder shouldn't visit PHI nodes!" assert llvm-svn: 147439
2012-01-03 05:25:10 +08:00
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-f128:128:128-n8:16:32"
target triple = "i386-apple-darwin"
; LSR should convert the inner loop (bb7.us) IV (j.01.us) into float*.
; This involves a nested AddRec, the outer AddRec's loop invariant components
; cannot find a preheader, so they should be expanded in the loop header
; (bb7.lr.ph.us) below the existing phi i.12.us.
LSR: Don't optimize loops if an outer loop has no preheader. LoopSimplify may not run on some outer loops, e.g. because of indirect branches. SCEVExpander simply cannot handle outer loops with no preheaders. Fixes rdar://10655343 SCEVExpander segfault. llvm-svn: 147718
2012-01-07 11:16:50 +08:00
; Currently, LSR won't kick in on such loops.
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: @nopreheader(
Fix SCEVExpander to handle loops with no preheader when LSR gives it a "phony" insertion point. Fixes rdar://10619599: "SelectionDAGBuilder shouldn't visit PHI nodes!" assert llvm-svn: 147439
2012-01-03 05:25:10 +08:00
; CHECK: bb7.us:
LSR: Don't optimize loops if an outer loop has no preheader. LoopSimplify may not run on some outer loops, e.g. because of indirect branches. SCEVExpander simply cannot handle outer loops with no preheaders. Fixes rdar://10655343 SCEVExpander segfault. llvm-svn: 147718
2012-01-07 11:16:50 +08:00
; CHECK-NOT: phi float*
; CHECK: %j.01.us = phi i32
; CHECK-NOT: phi float*
Fix SCEVExpander to handle loops with no preheader when LSR gives it a "phony" insertion point. Fixes rdar://10619599: "SelectionDAGBuilder shouldn't visit PHI nodes!" assert llvm-svn: 147439
2012-01-03 05:25:10 +08:00
define void @nopreheader(float* nocapture %a, i32 %n) nounwind {
entry:
%0 = sdiv i32 %n, undef
indirectbr i8* undef, [label %bb10.preheader]
bb10.preheader: ; preds = %bb4
indirectbr i8* undef, [label %bb8.preheader.lr.ph, label %return]
bb8.preheader.lr.ph: ; preds = %bb10.preheader
indirectbr i8* null, [label %bb7.lr.ph.us, label %bb9]
bb7.lr.ph.us: ; preds = %bb9.us, %bb8.preheader.lr.ph
%i.12.us = phi i32 [ %2, %bb9.us ], [ 0, %bb8.preheader.lr.ph ]
%tmp30 = mul i32 %0, %i.12.us
indirectbr i8* undef, [label %bb7.us]
bb7.us: ; preds = %bb7.lr.ph.us, %bb7.us
%j.01.us = phi i32 [ 0, %bb7.lr.ph.us ], [ %1, %bb7.us ]
%tmp31 = add i32 %tmp30, %j.01.us
%scevgep9 = getelementptr float* %a, i32 %tmp31
store float undef, float* %scevgep9, align 1
%1 = add nsw i32 %j.01.us, 1
indirectbr i8* undef, [label %bb9.us, label %bb7.us]
bb9.us: ; preds = %bb7.us
%2 = add nsw i32 %i.12.us, 1
indirectbr i8* undef, [label %bb7.lr.ph.us, label %return]
bb9: ; preds = %bb9, %bb8.preheader.lr.ph
indirectbr i8* undef, [label %bb9, label %return]
return: ; preds = %bb9, %bb9.us, %bb10.preheader
ret void
}
LSR: Don't optimize loops if an outer loop has no preheader. LoopSimplify may not run on some outer loops, e.g. because of indirect branches. SCEVExpander simply cannot handle outer loops with no preheaders. Fixes rdar://10655343 SCEVExpander segfault. llvm-svn: 147718
2012-01-07 11:16:50 +08:00
; In this case, SCEVExpander simply cannot materialize the AddRecExpr
; that LSR picks. We must detect that %bb8.preheader does not have a
; preheader and avoid performing LSR on %bb7.
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: @nopreheader2(
LSR: Don't optimize loops if an outer loop has no preheader. LoopSimplify may not run on some outer loops, e.g. because of indirect branches. SCEVExpander simply cannot handle outer loops with no preheaders. Fixes rdar://10655343 SCEVExpander segfault. llvm-svn: 147718
2012-01-07 11:16:50 +08:00
; CHECK: bb7:
; CHECK: %indvar = phi i32
define fastcc void @nopreheader2([200 x i32]* nocapture %Array2) nounwind {
entry:
indirectbr i8* undef, [label %bb]
bb: ; preds = %bb, %entry
indirectbr i8* undef, [label %bb3, label %bb]
bb3: ; preds = %bb3, %bb
indirectbr i8* undef, [label %bb8.preheader, label %bb3]
bb8.preheader: ; preds = %bb9, %bb3
%indvar5 = phi i32 [ %indvar.next6, %bb9 ], [ 0, %bb3 ]
%tmp26 = add i32 %indvar5, 13
indirectbr i8* null, [label %bb7]
bb7: ; preds = %bb8.preheader, %bb7
%indvar = phi i32 [ 0, %bb8.preheader ], [ %indvar.next, %bb7 ]
%scevgep = getelementptr [200 x i32]* %Array2, i32 %tmp26, i32 %indvar
store i32 undef, i32* %scevgep, align 4
%indvar.next = add i32 %indvar, 1
indirectbr i8* undef, [label %bb9, label %bb7]
bb9: ; preds = %bb7
%indvar.next6 = add i32 %indvar5, 1
indirectbr i8* undef, [label %return, label %bb8.preheader]
return: ; preds = %bb9
ret void
}