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llvm-6502/test/Transforms/LoopStrengthReduce/X86/2012-01-13-phielim.ll

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Fix a corner case hit by redundant phi elimination running after LSR. Fixes PR11761: bad IR w/ redundant Phi elim git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148177 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-14 03:17:23 +00:00
; RUN: llc < %s -O3 -march=x86-64 -mcpu=core2 | FileCheck %s
declare i1 @check() nounwind
declare i1 @foo(i8*, i8*, i8*) nounwind
; Check that redundant phi elimination ran
; CHECK: @test
; CHECK: %while.body.i
; CHECK: movs
; CHECK-NOT: movs
; CHECK: %for.end.i
define i32 @test(i8* %base) nounwind uwtable ssp {
entry:
br label %while.body.lr.ph.i
while.body.lr.ph.i: ; preds = %cond.true.i
br label %while.body.i
while.body.i: ; preds = %cond.true29.i, %while.body.lr.ph.i
%indvars.iv7.i = phi i64 [ 16, %while.body.lr.ph.i ], [ %indvars.iv.next8.i, %cond.true29.i ]
%i.05.i = phi i64 [ 0, %while.body.lr.ph.i ], [ %indvars.iv7.i, %cond.true29.i ]
%sext.i = shl i64 %i.05.i, 32
%idx.ext.i = ashr exact i64 %sext.i, 32
%add.ptr.sum.i = add i64 %idx.ext.i, 16
br label %for.body.i
for.body.i: ; preds = %for.body.i, %while.body.i
%indvars.iv.i = phi i64 [ 0, %while.body.i ], [ %indvars.iv.next.i, %for.body.i ]
%add.ptr.sum = add i64 %add.ptr.sum.i, %indvars.iv.i
%arrayidx22.i = getelementptr inbounds i8* %base, i64 %add.ptr.sum
%0 = load i8* %arrayidx22.i, align 1
%indvars.iv.next.i = add i64 %indvars.iv.i, 1
%cmp = call i1 @check() nounwind
br i1 %cmp, label %for.end.i, label %for.body.i
for.end.i: ; preds = %for.body.i
%add.ptr.i144 = getelementptr inbounds i8* %base, i64 %add.ptr.sum.i
%cmp2 = tail call i1 @foo(i8* %add.ptr.i144, i8* %add.ptr.i144, i8* undef) nounwind
br i1 %cmp2, label %cond.true29.i, label %cond.false35.i
cond.true29.i: ; preds = %for.end.i
%indvars.iv.next8.i = add i64 %indvars.iv7.i, 16
br i1 false, label %exit, label %while.body.i
cond.false35.i: ; preds = %for.end.i
unreachable
exit: ; preds = %cond.true29.i, %cond.true.i
ret i32 0
}
SCEVExpander fixes. Affects LSR and indvars. LSR has gradually been improved to more aggressively reuse existing code, particularly existing phi cycles. This exposed problems with the SCEVExpander's sloppy treatment of its insertion point. I applied some rigor to the insertion point problem that will hopefully avoid an endless bug cycle in this area. Changes: - Always used properlyDominates to check safe code hoisting. - The insertion point provided to SCEV is now considered a lower bound. This is usually a block terminator or the use itself. Under no cirumstance may SCEVExpander insert below this point. - LSR is reponsible for finding a "canonical" insertion point across expansion of different expressions. - Robust logic to determine whether IV increments are in "expanded" form and/or can be safely hoisted above some insertion point. Fixes PR11783: SCEVExpander assert. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148535 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-20 07:41:13 +00:00
%struct.anon.7.91.199.307.415.475.559.643.751.835.943.1003.1111.1219.1351.1375.1399.1435.1471.1483.1519.1531.1651.1771 = type { i32, i32, i32 }
@tags = external global [5000 x %struct.anon.7.91.199.307.415.475.559.643.751.835.943.1003.1111.1219.1351.1375.1399.1435.1471.1483.1519.1531.1651.1771], align 16
Test case comments missing from my previous checkin. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148571 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-20 21:21:27 +00:00
; PR11782: SCEVExpander assert
;
; Test phi reuse after LSR that requires SCEVExpander to hoist an
; interesting GEP.
;
SCEVExpander fixes. Affects LSR and indvars. LSR has gradually been improved to more aggressively reuse existing code, particularly existing phi cycles. This exposed problems with the SCEVExpander's sloppy treatment of its insertion point. I applied some rigor to the insertion point problem that will hopefully avoid an endless bug cycle in this area. Changes: - Always used properlyDominates to check safe code hoisting. - The insertion point provided to SCEV is now considered a lower bound. This is usually a block terminator or the use itself. Under no cirumstance may SCEVExpander insert below this point. - LSR is reponsible for finding a "canonical" insertion point across expansion of different expressions. - Robust logic to determine whether IV increments are in "expanded" form and/or can be safely hoisted above some insertion point. Fixes PR11783: SCEVExpander assert. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148535 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-20 07:41:13 +00:00
; CHECK: @test2
; CHECK: %entry
; CHECK-NOT: mov
Flip the new block-placement pass to be on by default. This is mostly to test the waters. I'd like to get results from FNT build bots and other bots running on non-x86 platforms. This feature has been pretty heavily tested over the last few months by me, and it fixes several of the execution time regressions caused by the inlining work by preventing inlining decisions from radically impacting block layout. I've seen very large improvements in yacr2 and ackermann benchmarks, along with the expected noise across all of the benchmark suite whenever code layout changes. I've analyzed all of the regressions and fixed them, or found them to be impossible to fix. See my email to llvmdev for more details. I'd like for this to be in 3.1 as it complements the inliner changes, but if any failures are showing up or anyone has concerns, it is just a flag flip and so can be easily turned off. I'm switching it on tonight to try and get at least one run through various folks' performance suites in case SPEC or something else has serious issues with it. I'll watch bots and revert if anything shows up. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154816 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-16 13:49:17 +00:00
; CHECK: je
SCEVExpander fixes. Affects LSR and indvars. LSR has gradually been improved to more aggressively reuse existing code, particularly existing phi cycles. This exposed problems with the SCEVExpander's sloppy treatment of its insertion point. I applied some rigor to the insertion point problem that will hopefully avoid an endless bug cycle in this area. Changes: - Always used properlyDominates to check safe code hoisting. - The insertion point provided to SCEV is now considered a lower bound. This is usually a block terminator or the use itself. Under no cirumstance may SCEVExpander insert below this point. - LSR is reponsible for finding a "canonical" insertion point across expansion of different expressions. - Robust logic to determine whether IV increments are in "expanded" form and/or can be safely hoisted above some insertion point. Fixes PR11783: SCEVExpander assert. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148535 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-20 07:41:13 +00:00
define void @test2(i32 %n) nounwind uwtable {
entry:
br i1 undef, label %while.end, label %for.cond468
for.cond468: ; preds = %if.then477, %entry
%indvars.iv1163 = phi i64 [ %indvars.iv.next1164, %if.then477 ], [ 1, %entry ]
%k.0.in = phi i32* [ %last, %if.then477 ], [ getelementptr inbounds ([5000 x %struct.anon.7.91.199.307.415.475.559.643.751.835.943.1003.1111.1219.1351.1375.1399.1435.1471.1483.1519.1531.1651.1771]* @tags, i64 0, i64 0, i32 2), %entry ]
%k.0 = load i32* %k.0.in, align 4
%0 = trunc i64 %indvars.iv1163 to i32
%cmp469 = icmp slt i32 %0, %n
br i1 %cmp469, label %for.body471, label %for.inc498
for.body471: ; preds = %for.cond468
%first = getelementptr inbounds [5000 x %struct.anon.7.91.199.307.415.475.559.643.751.835.943.1003.1111.1219.1351.1375.1399.1435.1471.1483.1519.1531.1651.1771]* @tags, i64 0, i64 %indvars.iv1163, i32 1
%1 = load i32* %first, align 4
br i1 undef, label %if.then477, label %for.inc498
if.then477: ; preds = %for.body471
%last = getelementptr inbounds [5000 x %struct.anon.7.91.199.307.415.475.559.643.751.835.943.1003.1111.1219.1351.1375.1399.1435.1471.1483.1519.1531.1651.1771]* @tags, i64 0, i64 %indvars.iv1163, i32 2
%indvars.iv.next1164 = add i64 %indvars.iv1163, 1
br label %for.cond468
for.inc498: ; preds = %for.inc498, %for.body471, %for.cond468
br label %for.inc498
while.end: ; preds = %entry
ret void
}
LSR fix: add a missing phi check during IV hoisting. Fixes PR12898: SCEVExpander crash. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157263 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-22 17:39:59 +00:00
; PR12898: SCEVExpander crash
; Test redundant phi elimination when the deleted phi's increment is
; itself a phi.
;
; CHECK: @test3
; CHECK: %for.body3.lr.ph.us.i.loopexit
; CHECK-NEXT: in Loop: Header
; CHECK-NEXT: incq
; CHECK-NEXT: %for.body3.us.i
; CHECK-NEXT: Inner Loop
; CHECK: testb
; CHECK: jne
; CHECK: jmp
define fastcc void @test3(double* nocapture %u) nounwind uwtable ssp {
entry:
br i1 undef, label %meshBB1, label %meshBB5
for.inc8.us.i: ; preds = %for.body3.us.i
br i1 undef, label %meshBB1, label %meshBB
for.body3.us.i: ; preds = %meshBB, %for.body3.lr.ph.us.i
%indvars.iv.i.SV.phi = phi i64 [ %indvars.iv.next.i, %meshBB ], [ 0, %for.body3.lr.ph.us.i ]
%storemerge13.us.i.SV.phi = phi i32 [ 0, %meshBB ], [ 0, %for.body3.lr.ph.us.i ]
%Opq.sa.calc12 = sub i32 undef, 227
%0 = add nsw i64 %indvars.iv.i.SV.phi, %indvars.iv8.i.SV.phi26
%1 = trunc i64 %0 to i32
%mul.i.us.i = mul nsw i32 0, %1
%arrayidx5.us.i = getelementptr inbounds double* %u, i64 %indvars.iv.i.SV.phi
%2 = load double* %arrayidx5.us.i, align 8
%indvars.iv.next.i = add i64 %indvars.iv.i.SV.phi, 1
br i1 undef, label %for.inc8.us.i, label %meshBB
for.body3.lr.ph.us.i: ; preds = %meshBB1, %meshBB
%indvars.iv8.i.SV.phi26 = phi i64 [ undef, %meshBB1 ], [ %indvars.iv8.i.SV.phi24, %meshBB ]
%arrayidx.us.i = getelementptr inbounds double* undef, i64 %indvars.iv8.i.SV.phi26
%3 = add i64 %indvars.iv8.i.SV.phi26, 1
br label %for.body3.us.i
for.inc8.us.i2: ; preds = %meshBB5
unreachable
eval_At_times_u.exit: ; preds = %meshBB5
ret void
meshBB: ; preds = %for.body3.us.i, %for.inc8.us.i
%indvars.iv8.i.SV.phi24 = phi i64 [ undef, %for.body3.us.i ], [ %3, %for.inc8.us.i ]
%meshStackVariable.phi = phi i32 [ %Opq.sa.calc12, %for.body3.us.i ], [ undef, %for.inc8.us.i ]
br i1 undef, label %for.body3.lr.ph.us.i, label %for.body3.us.i
meshBB1: ; preds = %for.inc8.us.i, %entry
br label %for.body3.lr.ph.us.i
meshBB5: ; preds = %entry
br i1 undef, label %eval_At_times_u.exit, label %for.inc8.us.i2
}
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