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llvm-project/llvm/test/Transforms/SimpleLoopUnswitch/endless-unswitch.ll
Matthew Devereau 6561fa3d02
[LoopUnswitch] Allow i1 truncs in loop unswitch (#89738) 
With the addition of #84628, truncs to i1 are being emitted as
conditions to branch instructions. This caused significant regressions
in cases which were previously improved by loop unswitch. Adding truncs
to i1 restore the previous performance seen.
2024-04-29 15:17:48 +01:00

202 lines
8.3 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes='loop-mssa(simple-loop-unswitch<nontrivial>),loop-mssa(simple-loop-unswitch<nontrivial>),verify<loops>' -S < %s | FileCheck %s
; Below bugs have caused endless unswitch.
;
; https://bugs.llvm.org/show_bug.cgi?id=50279
; https://bugs.llvm.org/show_bug.cgi?id=50302
;
; This test's loop should be unswitched only one time even though we run
; SimpleLoopUnswitch pass two times.
@a = dso_local local_unnamed_addr global i32 0, align 4
@c = dso_local local_unnamed_addr global i32 0, align 4
@b = dso_local local_unnamed_addr global i8 0, align 1
; Function Attrs: nofree norecurse nosync nounwind uwtable
define dso_local void @d() {
; CHECK-LABEL: @d(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: br i1 false, label [[FOR_END:%.*]], label [[FOR_COND]]
; CHECK: for.end:
; CHECK-NEXT: [[TMP0:%.*]] = load i16, ptr null, align 2
; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i16 [[TMP0]], 0
; CHECK-NEXT: br i1 [[TMP1]], label [[FOR_END_SPLIT:%.*]], label [[FOR_END_SPLIT_US:%.*]]
; CHECK: for.end.split.us:
; CHECK-NEXT: br label [[G_US:%.*]]
; CHECK: g.us:
; CHECK-NEXT: br label [[G_SPLIT_US6:%.*]]
; CHECK: for.cond1.us1:
; CHECK-NEXT: [[TMP2:%.*]] = load i16, ptr null, align 2
; CHECK-NEXT: [[TOBOOL4_NOT_US:%.*]] = icmp eq i16 [[TMP2]], 0
; CHECK-NEXT: br i1 [[TOBOOL4_NOT_US]], label [[FOR_COND5_PREHEADER_US4:%.*]], label [[G_LOOPEXIT_US:%.*]]
; CHECK: for.cond5.us2:
; CHECK-NEXT: br i1 false, label [[FOR_COND1_LOOPEXIT_US5:%.*]], label [[FOR_INC_US3:%.*]]
; CHECK: for.inc.us3:
; CHECK-NEXT: store i8 0, ptr @b, align 1
; CHECK-NEXT: br label [[FOR_COND5_US2:%.*]]
; CHECK: for.cond5.preheader.us4:
; CHECK-NEXT: br label [[FOR_COND5_US2]]
; CHECK: for.cond1.loopexit.us5:
; CHECK-NEXT: br label [[FOR_COND1_US1:%.*]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: g.loopexit.us:
; CHECK-NEXT: br label [[G_US]]
; CHECK: g.split.us6:
; CHECK-NEXT: br label [[FOR_COND1_US1]]
; CHECK: for.end.split:
; CHECK-NEXT: br label [[G:%.*]]
; CHECK: g.loopexit:
; CHECK-NEXT: br label [[G]], !llvm.loop [[LOOP2:![0-9]+]]
; CHECK: g:
; CHECK-NEXT: [[TMP3:%.*]] = load i16, ptr null, align 2
; CHECK-NEXT: [[TMP4:%.*]] = icmp eq i16 [[TMP3]], 0
; CHECK-NEXT: br i1 [[TMP4]], label [[G_SPLIT_US:%.*]], label [[G_SPLIT:%.*]]
; CHECK: g.split.us:
; CHECK-NEXT: br label [[FOR_COND1_US:%.*]]
; CHECK: for.cond1.us:
; CHECK-NEXT: br label [[FOR_COND5_PREHEADER_US:%.*]]
; CHECK: for.cond5.us:
; CHECK-NEXT: br i1 false, label [[FOR_COND1_LOOPEXIT_US:%.*]], label [[FOR_INC_US:%.*]]
; CHECK: for.inc.us:
; CHECK-NEXT: store i8 0, ptr @b, align 1
; CHECK-NEXT: br label [[FOR_COND5_US:%.*]]
; CHECK: for.cond5.preheader.us:
; CHECK-NEXT: br label [[FOR_COND5_US]]
; CHECK: for.cond1.loopexit.us:
; CHECK-NEXT: br label [[FOR_COND1_US]]
; CHECK: g.split:
; CHECK-NEXT: br label [[FOR_COND1:%.*]]
; CHECK: for.cond1.loopexit:
; CHECK-NEXT: br label [[FOR_COND1]], !llvm.loop [[LOOP0]]
; CHECK: for.cond1:
; CHECK-NEXT: [[TMP5:%.*]] = load i16, ptr null, align 2
; CHECK-NEXT: [[TOBOOL4_NOT:%.*]] = icmp eq i16 [[TMP5]], 0
; CHECK-NEXT: br i1 [[TOBOOL4_NOT]], label [[FOR_COND5_PREHEADER:%.*]], label [[G_LOOPEXIT:%.*]]
; CHECK: for.cond5.preheader:
; CHECK-NEXT: br label [[FOR_COND5:%.*]]
; CHECK: for.cond5:
; CHECK-NEXT: br i1 false, label [[FOR_COND1_LOOPEXIT:%.*]], label [[FOR_INC:%.*]]
; CHECK: for.inc:
; CHECK-NEXT: store i8 0, ptr @b, align 1
; CHECK-NEXT: br label [[FOR_COND5]]
;
entry:
br label %for.cond
for.cond: ; preds = %for.cond, %entry
br i1 false, label %for.end, label %for.cond
for.end: ; preds = %for.cond
br label %g
g: ; preds = %for.cond1, %for.end
br label %for.cond1
for.cond1: ; preds = %for.cond5, %g
%0 = load i16, ptr null, align 2
%tobool4.not = icmp eq i16 %0, 0
br i1 %tobool4.not, label %for.cond5, label %g
for.cond5: ; preds = %for.inc, %for.cond1
br i1 false, label %for.cond1, label %for.inc
for.inc: ; preds = %for.cond5
store i8 0, ptr @b, align 1
br label %for.cond5
}
define void @e(ptr %p) {
; CHECK-LABEL: @e(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: br i1 false, label [[FOR_END:%.*]], label [[FOR_COND]]
; CHECK: for.end:
; CHECK-NEXT: [[TMP0:%.*]] = load i16, ptr [[P:%.*]], align 2
; CHECK-NEXT: [[TMP1:%.*]] = trunc i16 [[TMP0]] to i1
; CHECK-NEXT: br i1 [[TMP1]], label [[FOR_END_SPLIT:%.*]], label [[FOR_END_SPLIT_US:%.*]]
; CHECK: for.end.split.us:
; CHECK-NEXT: br label [[G_US:%.*]]
; CHECK: g.us:
; CHECK-NEXT: br label [[G_SPLIT_US6:%.*]]
; CHECK: for.cond1.us1:
; CHECK-NEXT: [[TMP2:%.*]] = load i16, ptr [[P]], align 2
; CHECK-NEXT: [[TOBOOL4_NOT_US:%.*]] = trunc i16 [[TMP2]] to i1
; CHECK-NEXT: br i1 [[TOBOOL4_NOT_US]], label [[FOR_COND5_PREHEADER_US4:%.*]], label [[G_LOOPEXIT_US:%.*]]
; CHECK: for.cond5.us2:
; CHECK-NEXT: br i1 false, label [[FOR_COND1_LOOPEXIT_US5:%.*]], label [[FOR_INC_US3:%.*]]
; CHECK: for.inc.us3:
; CHECK-NEXT: store i8 0, ptr @b, align 1
; CHECK-NEXT: br label [[FOR_COND5_US2:%.*]]
; CHECK: for.cond5.preheader.us4:
; CHECK-NEXT: br label [[FOR_COND5_US2]]
; CHECK: for.cond1.loopexit.us5:
; CHECK-NEXT: br label [[FOR_COND1_US1:%.*]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK: g.loopexit.us:
; CHECK-NEXT: br label [[G_US]]
; CHECK: g.split.us6:
; CHECK-NEXT: br label [[FOR_COND1_US1]]
; CHECK: for.end.split:
; CHECK-NEXT: br label [[G:%.*]]
; CHECK: g.loopexit:
; CHECK-NEXT: br label [[G]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK: g:
; CHECK-NEXT: [[TMP3:%.*]] = load i16, ptr [[P]], align 2
; CHECK-NEXT: [[TMP4:%.*]] = trunc i16 [[TMP3]] to i1
; CHECK-NEXT: br i1 [[TMP4]], label [[G_SPLIT_US:%.*]], label [[G_SPLIT:%.*]]
; CHECK: g.split.us:
; CHECK-NEXT: br label [[FOR_COND1_US:%.*]]
; CHECK: for.cond1.us:
; CHECK-NEXT: br label [[FOR_COND5_PREHEADER_US:%.*]]
; CHECK: for.cond5.us:
; CHECK-NEXT: br i1 false, label [[FOR_COND1_LOOPEXIT_US:%.*]], label [[FOR_INC_US:%.*]]
; CHECK: for.inc.us:
; CHECK-NEXT: store i8 0, ptr @b, align 1
; CHECK-NEXT: br label [[FOR_COND5_US:%.*]]
; CHECK: for.cond5.preheader.us:
; CHECK-NEXT: br label [[FOR_COND5_US]]
; CHECK: for.cond1.loopexit.us:
; CHECK-NEXT: br label [[FOR_COND1_US]]
; CHECK: g.split:
; CHECK-NEXT: br label [[FOR_COND1:%.*]]
; CHECK: for.cond1.loopexit:
; CHECK-NEXT: br label [[FOR_COND1]], !llvm.loop [[LOOP3]]
; CHECK: for.cond1:
; CHECK-NEXT: [[TMP5:%.*]] = load i16, ptr [[P]], align 2
; CHECK-NEXT: [[TOBOOL4_NOT:%.*]] = trunc i16 [[TMP5]] to i1
; CHECK-NEXT: br i1 [[TOBOOL4_NOT]], label [[FOR_COND5_PREHEADER:%.*]], label [[G_LOOPEXIT:%.*]]
; CHECK: for.cond5.preheader:
; CHECK-NEXT: br label [[FOR_COND5:%.*]]
; CHECK: for.cond5:
; CHECK-NEXT: br i1 false, label [[FOR_COND1_LOOPEXIT:%.*]], label [[FOR_INC:%.*]]
; CHECK: for.inc:
; CHECK-NEXT: store i8 0, ptr @b, align 1
; CHECK-NEXT: br label [[FOR_COND5]]
;
entry:
br label %for.cond
for.cond: ; preds = %for.cond, %entry
br i1 false, label %for.end, label %for.cond
for.end: ; preds = %for.cond
br label %g
g: ; preds = %for.cond1, %for.end
br label %for.cond1
for.cond1: ; preds = %for.cond5, %g
%0 = load i16, ptr %p, align 2
%tobool4.not = trunc i16 %0 to i1
br i1 %tobool4.not, label %for.cond5, label %g
for.cond5: ; preds = %for.inc, %for.cond1
br i1 false, label %for.cond1, label %for.inc
for.inc: ; preds = %for.cond5
store i8 0, ptr @b, align 1
br label %for.cond5
}
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