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llvm-6502/test/Transforms/LoopUnswitch/preserve-analyses.ll

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Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ModuleID This is done to avoid odd test failures, like the one fixed in r171243. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171250 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-30 02:33:22 +00:00
; RUN: opt -loop-unswitch -verify-loop-info -verify-dom-info -disable-output < %s
Re-apply r80926, with fixes: keep the domtree informed of new blocks that get created during loop unswitching, and fix SplitBlockPredecessors' LCSSA updating code to create new PHIs instead of trying to just move existing ones. Also, optimize Loop::verifyLoop, since it gets called a lot. Use searches on a sorted list of blocks instead of calling the "contains" function, as is done in other places in the Loop class, since "contains" does a linear search. Also, don't call verifyLoop from LoopSimplify or LCSSA, as the PassManager is already calling verifyLoop as part of LoopInfo's verifyAnalysis. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81221 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-08 15:45:00 +00:00
; Loop unswitch should be able to unswitch these loops and
; preserve LCSSA and LoopSimplify forms.
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:64"
target triple = "armv6-apple-darwin9"
@delim1 = external global i32 ; <i32*> [#uses=1]
@delim2 = external global i32 ; <i32*> [#uses=1]
Remove arm_apcscc from the test files. It is the default and doing this matches what llvm-gcc and clang now produce. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106221 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-17 15:18:27 +00:00
define i32 @ineqn(i8* %s, i8* %p) nounwind readonly {
Re-apply r80926, with fixes: keep the domtree informed of new blocks that get created during loop unswitching, and fix SplitBlockPredecessors' LCSSA updating code to create new PHIs instead of trying to just move existing ones. Also, optimize Loop::verifyLoop, since it gets called a lot. Use searches on a sorted list of blocks instead of calling the "contains" function, as is done in other places in the Loop class, since "contains" does a linear search. Also, don't call verifyLoop from LoopSimplify or LCSSA, as the PassManager is already calling verifyLoop as part of LoopInfo's verifyAnalysis. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81221 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-08 15:45:00 +00:00
entry:
%0 = load i32* @delim1, align 4 ; <i32> [#uses=1]
%1 = load i32* @delim2, align 4 ; <i32> [#uses=1]
br label %bb8.outer
bb: ; preds = %bb8
%2 = icmp eq i8* %p_addr.0, %s ; <i1> [#uses=1]
br i1 %2, label %bb10, label %bb2
bb2: ; preds = %bb
%3 = getelementptr inbounds i8* %p_addr.0, i32 1 ; <i8*> [#uses=3]
switch i32 %ineq.0.ph, label %bb8.backedge [
i32 0, label %bb3
i32 1, label %bb6
]
bb8.backedge: ; preds = %bb6, %bb5, %bb2
br label %bb8
bb3: ; preds = %bb2
%4 = icmp eq i32 %8, %0 ; <i1> [#uses=1]
br i1 %4, label %bb8.outer.loopexit, label %bb5
bb5: ; preds = %bb3
br i1 %6, label %bb6, label %bb8.backedge
bb6: ; preds = %bb5, %bb2
%5 = icmp eq i32 %8, %1 ; <i1> [#uses=1]
br i1 %5, label %bb7, label %bb8.backedge
bb7: ; preds = %bb6
%.lcssa1 = phi i8* [ %3, %bb6 ] ; <i8*> [#uses=1]
br label %bb8.outer.backedge
bb8.outer.backedge: ; preds = %bb8.outer.loopexit, %bb7
%.lcssa2 = phi i8* [ %.lcssa1, %bb7 ], [ %.lcssa, %bb8.outer.loopexit ] ; <i8*> [#uses=1]
%ineq.0.ph.be = phi i32 [ 0, %bb7 ], [ 1, %bb8.outer.loopexit ] ; <i32> [#uses=1]
br label %bb8.outer
bb8.outer.loopexit: ; preds = %bb3
%.lcssa = phi i8* [ %3, %bb3 ] ; <i8*> [#uses=1]
br label %bb8.outer.backedge
bb8.outer: ; preds = %bb8.outer.backedge, %entry
%ineq.0.ph = phi i32 [ 0, %entry ], [ %ineq.0.ph.be, %bb8.outer.backedge ] ; <i32> [#uses=3]
%p_addr.0.ph = phi i8* [ %p, %entry ], [ %.lcssa2, %bb8.outer.backedge ] ; <i8*> [#uses=1]
%6 = icmp eq i32 %ineq.0.ph, 1 ; <i1> [#uses=1]
br label %bb8
bb8: ; preds = %bb8.outer, %bb8.backedge
%p_addr.0 = phi i8* [ %p_addr.0.ph, %bb8.outer ], [ %3, %bb8.backedge ] ; <i8*> [#uses=3]
%7 = load i8* %p_addr.0, align 1 ; <i8> [#uses=2]
%8 = sext i8 %7 to i32 ; <i32> [#uses=2]
%9 = icmp eq i8 %7, 0 ; <i1> [#uses=1]
br i1 %9, label %bb10, label %bb
bb10: ; preds = %bb8, %bb
%.0 = phi i32 [ %ineq.0.ph, %bb ], [ 0, %bb8 ] ; <i32> [#uses=1]
ret i32 %.0
}
; This is a simplified form of ineqn from above. It triggers some
; different cases in the loop-unswitch code.
define void @simplified_ineqn() nounwind readonly {
entry:
br label %bb8.outer
bb8.outer: ; preds = %bb6, %bb2, %entry
%x = phi i32 [ 0, %entry ], [ 0, %bb6 ], [ 1, %bb2 ] ; <i32> [#uses=1]
br i1 undef, label %return, label %bb2
bb2: ; preds = %bb
switch i32 %x, label %bb6 [
i32 0, label %bb8.outer
]
bb6: ; preds = %bb2
br i1 undef, label %bb8.outer, label %bb2
return: ; preds = %bb8, %bb
ret void
}
Fix SplitCriticalEdge to properly update LCSSA form when splitting a loop exit edge -- new PHIs may be needed not only for the additional splits that are made to preserve LoopSimplify form, but also for the original split. Factor out the code that inserts new PHIs so that it can be used for both. Remove LoopRotation.cpp's code for manually updating LCSSA form, as it is now redundant. This fixes PR4934. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81363 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-09 18:18:18 +00:00
; This function requires special handling to preserve LCSSA form.
; PR4934
define void @pnp_check_irq() nounwind noredzone {
entry:
%conv56 = trunc i64 undef to i32 ; <i32> [#uses=1]
br label %while.cond.i
while.cond.i: ; preds = %while.cond.i.backedge, %entry
%call.i25 = call i8* @pci_get_device() nounwind noredzone ; <i8*> [#uses=2]
br i1 undef, label %if.then65, label %while.body.i
while.body.i: ; preds = %while.cond.i
br i1 undef, label %if.then31.i.i, label %while.cond.i.backedge
while.cond.i.backedge: ; preds = %if.then31.i.i, %while.body.i
br label %while.cond.i
if.then31.i.i: ; preds = %while.body.i
switch i32 %conv56, label %while.cond.i.backedge [
i32 14, label %if.then42.i.i
i32 15, label %if.then42.i.i
]
if.then42.i.i: ; preds = %if.then31.i.i, %if.then31.i.i
%call.i25.lcssa48 = phi i8* [ %call.i25, %if.then31.i.i ], [ %call.i25, %if.then31.i.i ] ; <i8*> [#uses=0]
unreachable
if.then65: ; preds = %while.cond.i
unreachable
}
declare i8* @pci_get_device() noredzone
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