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[LoopVersioning] Require loop-simplify form for loop versioning. Summary: Requiring loop-simplify form for loop versioning ensures that the runtime check block always dominates the exit block. This patch closes #30958 (https://llvm.org/bugs/show_bug.cgi?id=30958). Reviewers: silviu.baranga, hfinkel, anemet, ashutosh.nema Subscribers: ashutosh.nema, mzolotukhin, efriedma, hfinkel, llvm-commits Differential Revision: https://reviews.llvm.org/D27469 llvm-svn: 290116
2016-12-20 01:13:37 +08:00
; This test ensures loop versioning does not produce an invalid dominator tree
; if the exit block of the loop (bb0) dominates the runtime check block
; (bb1 will become the runtime check block).
[LDist] Match behavior between invoking via optimization pipeline or opt -loop-distribute In r267672, where the loop distribution pragma was introduced, I tried it hard to keep the old behavior for opt: when opt is invoked with -loop-distribute, it should distribute the loop (it's off by default when ran via the optimization pipeline). As MichaelZ has discovered this has the unintended consequence of breaking a very common developer work-flow to reproduce compilations using opt: First you print the pass pipeline of clang with -debug-pass=Arguments and then invoking opt with the returned arguments. clang -debug-pass will include -loop-distribute but the pass is invoked with default=off so nothing happens unless the loop carries the pragma. While through opt (default=on) we will try to distribute all loops. This changes opt's default to off as well to match clang. The tests are modified to explicitly enable the transformation. llvm-svn: 290235
2016-12-21 12:07:40 +08:00
; RUN: opt -loop-distribute -enable-loop-distribute -verify-dom-info -S -o - %s > %t
; RUN: opt -loop-simplify -loop-distribute -enable-loop-distribute -verify-dom-info -S -o - %s > %t
[LoopVersioning] Require loop-simplify form for loop versioning. Summary: Requiring loop-simplify form for loop versioning ensures that the runtime check block always dominates the exit block. This patch closes #30958 (https://llvm.org/bugs/show_bug.cgi?id=30958). Reviewers: silviu.baranga, hfinkel, anemet, ashutosh.nema Subscribers: ashutosh.nema, mzolotukhin, efriedma, hfinkel, llvm-commits Differential Revision: https://reviews.llvm.org/D27469 llvm-svn: 290116
2016-12-20 01:13:37 +08:00
; RUN: FileCheck --check-prefix CHECK-VERSIONING -input-file %t %s
; RUN: opt -loop-versioning -verify-dom-info -S -o - %s > %t
; RUN: opt -loop-simplify -loop-versioning -verify-dom-info -S -o - %s > %t
; RUN: FileCheck --check-prefix CHECK-VERSIONING -input-file %t %s
@c1 = external global i16
define void @f(i16 %a) {
br label %bb0
bb0:
br label %bb1
bb1:
%tmp1 = load i16, i16* @c1
br label %bb2
bb2:
%tmp2 = phi i16 [ %tmp1, %bb1 ], [ %tmp3, %bb2 ]
%tmp4 = getelementptr inbounds [1 x i32], [1 x i32]* undef, i32 0, i32 4
store i32 1, i32* %tmp4
%tmp5 = getelementptr inbounds [1 x i32], [1 x i32]* undef, i32 0, i32 9
store i32 0, i32* %tmp5
%tmp3 = add i16 %tmp2, 1
store i16 %tmp2, i16* @c1
%tmp6 = icmp sle i16 %tmp3, 0
br i1 %tmp6, label %bb2, label %bb0
}
; Simple check to make sure loop versioning happened.
; CHECK-VERSIONING: bb2.lver.check: