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llvm-mirror/test/Transforms/LoopStrengthReduce/X86/2012-01-13-phielim.ll
Chandler Carruth 49d4e3f282 Add a much more conservative strategy for aligning branch targets. 
Previously, MBP essentially aligned every branch target it could. This
bloats code quite a bit, especially non-looping code which has no real
reason to prefer aligned branch targets so heavily.

As Andy said in review, it's still a bit odd to do this without a real
cost model, but this at least has much more plausible heuristics.

Fixes PR13265.

llvm-svn: 161409
2012-08-07 09:45:24 +00:00

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; 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
}
%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
; PR11782: SCEVExpander assert
;
; Test phi reuse after LSR that requires SCEVExpander to hoist an
; interesting GEP.
;
; CHECK: @test2
; CHECK: %entry
; CHECK-NOT: mov
; CHECK: je
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
}
; 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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