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llvm-mirror/test/Transforms/LoopVectorize/pr43166-fold-tail-by-masking.ll
Bjorn Pettersson f4d7c30670 [LV] Precommit test case showing miscompile from PR43166. NFC 
Summary:  Precommit test case showing miscompile from PR43166.

Reviewers: fhahn, Ayal

Reviewed By: fhahn

Subscribers: rkruppe, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67072

llvm-svn: 370720
2019-09-03 09:33:40 +00:00

236 lines
11 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -S | FileCheck %s
; Test cases below are reduced (and slightly modified) reproducers based on a
; problem seen when compiling a C program like this:
;
; #include <stdint.h>
; #include <stdio.h>
;
; int y = 0;
; int b = 1;
; int d = 1;
;
; int main() {
; #pragma clang loop vectorize_width(4)
; for (int i = 0; i < 3; ++i) {
; b = (y == 0) ? d : (d / y);
; }
;
; if (b == 1)
; printf("GOOD!\n");
; else
; printf("BAD!\n");
; }
;
; When compiled+executed using
; build-all/bin/clang -O1 lv-bug.c && ./a.out
; the result is "GOOD!"
;
; When compiled+executed using
; build-all/bin/clang -O1 lv-bug.c -fvectorize && ./a.out
; the result is "BAD!"
; FIXME: The result here is incorrect! See https://bugs.llvm.org/show_bug.cgi?id=43166
define i64 @test1(i64 %y) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: [[BROADCAST_SPLATINSERT1:%.*]] = insertelement <4 x i64> undef, i64 [[Y:%.*]], i32 0
; CHECK-NEXT: [[BROADCAST_SPLAT2:%.*]] = shufflevector <4 x i64> [[BROADCAST_SPLATINSERT1]], <4 x i64> undef, <4 x i32> zeroinitializer
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> undef, i32 [[INDEX]], i32 0
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> undef, <4 x i32> zeroinitializer
; CHECK-NEXT: [[INDUCTION:%.*]] = add <4 x i32> [[BROADCAST_SPLAT]], <i32 0, i32 1, i32 2, i32 3>
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[INDEX]], 0
; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <4 x i64> [[BROADCAST_SPLAT2]], zeroinitializer
; CHECK-NEXT: [[TMP2:%.*]] = xor <4 x i64> <i64 3, i64 3, i64 3, i64 3>, [[BROADCAST_SPLAT2]]
; CHECK-NEXT: [[TMP3:%.*]] = icmp ule <4 x i32> [[INDUCTION]], <i32 2, i32 2, i32 2, i32 2>
; CHECK-NEXT: [[TMP4:%.*]] = xor <4 x i1> [[TMP1]], <i1 true, i1 true, i1 true, i1 true>
; CHECK-NEXT: [[TMP5:%.*]] = and <4 x i1> [[TMP4]], [[TMP3]]
; CHECK-NEXT: [[TMP6:%.*]] = and <4 x i1> [[TMP1]], [[TMP3]]
; CHECK-NEXT: [[PREDPHI:%.*]] = select <4 x i1> [[TMP6]], <4 x i64> <i64 77, i64 77, i64 77, i64 77>, <4 x i64> [[TMP2]]
; CHECK-NEXT: [[INDEX_NEXT]] = add i32 [[INDEX]], 4
; CHECK-NEXT: [[TMP7:%.*]] = icmp eq i32 [[INDEX_NEXT]], 4
; CHECK-NEXT: br i1 [[TMP7]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop !0
; CHECK: middle.block:
; CHECK-NEXT: [[TMP8:%.*]] = extractelement <4 x i64> [[PREDPHI]], i32 3
; CHECK-NEXT: br i1 true, label [[FOR_COND_CLEANUP:%.*]], label [[SCALAR_PH]]
; CHECK: scalar.ph:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ 4, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[INC:%.*]], [[COND_END:%.*]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[Y]], 0
; CHECK-NEXT: br i1 [[CMP]], label [[COND_END]], label [[COND_FALSE:%.*]]
; CHECK: cond.false:
; CHECK-NEXT: [[DIV:%.*]] = xor i64 3, [[Y]]
; CHECK-NEXT: br label [[COND_END]]
; CHECK: cond.end:
; CHECK-NEXT: [[COND:%.*]] = phi i64 [ [[DIV]], [[COND_FALSE]] ], [ 77, [[FOR_BODY]] ]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i32 [[INC]], 3
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !llvm.loop !2
; CHECK: for.cond.cleanup:
; CHECK-NEXT: [[COND_LCSSA:%.*]] = phi i64 [ [[COND]], [[COND_END]] ], [ [[TMP8]], [[MIDDLE_BLOCK]] ]
; CHECK-NEXT: ret i64 [[COND_LCSSA]]
;
entry:
br label %for.body
for.body:
%i = phi i32 [ 0, %entry ], [ %inc, %cond.end ]
%cmp = icmp eq i64 %y, 0
br i1 %cmp, label %cond.end, label %cond.false
cond.false:
%div = xor i64 3, %y
br label %cond.end
cond.end:
%cond = phi i64 [ %div, %cond.false ], [ 77, %for.body ]
%inc = add nuw nsw i32 %i, 1
%exitcond = icmp eq i32 %inc, 3
br i1 %exitcond, label %for.cond.cleanup, label %for.body
for.cond.cleanup:
ret i64 %cond
}
; FIXME: The result here is incorrect! See https://bugs.llvm.org/show_bug.cgi?id=43166
define i64 @test2(i64 %y) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: [[BROADCAST_SPLATINSERT1:%.*]] = insertelement <4 x i64> undef, i64 [[Y:%.*]], i32 0
; CHECK-NEXT: [[BROADCAST_SPLAT2:%.*]] = shufflevector <4 x i64> [[BROADCAST_SPLATINSERT1]], <4 x i64> undef, <4 x i32> zeroinitializer
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> undef, i32 [[INDEX]], i32 0
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> undef, <4 x i32> zeroinitializer
; CHECK-NEXT: [[INDUCTION:%.*]] = add <4 x i32> [[BROADCAST_SPLAT]], <i32 0, i32 1, i32 2, i32 3>
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[INDEX]], 0
; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <4 x i64> [[BROADCAST_SPLAT2]], zeroinitializer
; CHECK-NEXT: [[TMP2:%.*]] = icmp ule <4 x i32> [[INDUCTION]], <i32 2, i32 2, i32 2, i32 2>
; CHECK-NEXT: [[TMP3:%.*]] = xor <4 x i1> [[TMP1]], <i1 true, i1 true, i1 true, i1 true>
; CHECK-NEXT: [[TMP4:%.*]] = and <4 x i1> [[TMP3]], [[TMP2]]
; CHECK-NEXT: [[TMP5:%.*]] = and <4 x i1> [[TMP1]], [[TMP2]]
; CHECK-NEXT: [[PREDPHI:%.*]] = select <4 x i1> [[TMP5]], <4 x i64> <i64 77, i64 77, i64 77, i64 77>, <4 x i64> <i64 55, i64 55, i64 55, i64 55>
; CHECK-NEXT: [[INDEX_NEXT]] = add i32 [[INDEX]], 4
; CHECK-NEXT: [[TMP6:%.*]] = icmp eq i32 [[INDEX_NEXT]], 4
; CHECK-NEXT: br i1 [[TMP6]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop !4
; CHECK: middle.block:
; CHECK-NEXT: [[TMP7:%.*]] = extractelement <4 x i64> [[PREDPHI]], i32 3
; CHECK-NEXT: br i1 true, label [[FOR_COND_CLEANUP:%.*]], label [[SCALAR_PH]]
; CHECK: scalar.ph:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ 4, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[INC:%.*]], [[COND_END:%.*]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[Y]], 0
; CHECK-NEXT: br i1 [[CMP]], label [[COND_END]], label [[COND_FALSE:%.*]]
; CHECK: cond.false:
; CHECK-NEXT: br label [[COND_END]]
; CHECK: cond.end:
; CHECK-NEXT: [[COND:%.*]] = phi i64 [ 55, [[COND_FALSE]] ], [ 77, [[FOR_BODY]] ]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i32 [[INC]], 3
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !llvm.loop !5
; CHECK: for.cond.cleanup:
; CHECK-NEXT: [[COND_LCSSA:%.*]] = phi i64 [ [[COND]], [[COND_END]] ], [ [[TMP7]], [[MIDDLE_BLOCK]] ]
; CHECK-NEXT: ret i64 [[COND_LCSSA]]
;
entry:
br label %for.body
for.body:
%i = phi i32 [ 0, %entry ], [ %inc, %cond.end ]
%cmp = icmp eq i64 %y, 0
br i1 %cmp, label %cond.end, label %cond.false
cond.false:
br label %cond.end
cond.end:
%cond = phi i64 [ 55, %cond.false ], [ 77, %for.body ]
%inc = add nuw nsw i32 %i, 1
%exitcond = icmp eq i32 %inc, 3
br i1 %exitcond, label %for.cond.cleanup, label %for.body
for.cond.cleanup:
ret i64 %cond
}
; FIXME: The result here is incorrect! See https://bugs.llvm.org/show_bug.cgi?id=43166
define i32 @test3(i64 %y) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i64> undef, i64 [[Y:%.*]], i32 0
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i64> [[BROADCAST_SPLATINSERT]], <4 x i64> undef, <4 x i32> zeroinitializer
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP0:%.*]] = icmp eq <4 x i64> [[BROADCAST_SPLAT]], zeroinitializer
; CHECK-NEXT: [[TMP1:%.*]] = icmp ule <4 x i32> [[VEC_IND]], <i32 2, i32 2, i32 2, i32 2>
; CHECK-NEXT: [[TMP2:%.*]] = xor <4 x i1> [[TMP0]], <i1 true, i1 true, i1 true, i1 true>
; CHECK-NEXT: [[TMP3:%.*]] = and <4 x i1> [[TMP2]], [[TMP1]]
; CHECK-NEXT: [[TMP4:%.*]] = and <4 x i1> [[TMP0]], [[TMP1]]
; CHECK-NEXT: [[PREDPHI:%.*]] = select <4 x i1> [[TMP4]], <4 x i32> [[VEC_IND]], <4 x i32> <i32 55, i32 55, i32 55, i32 55>
; CHECK-NEXT: [[INDEX_NEXT]] = add i32 [[INDEX]], 4
; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], <i32 4, i32 4, i32 4, i32 4>
; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[INDEX_NEXT]], 4
; CHECK-NEXT: br i1 [[TMP5]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop !6
; CHECK: middle.block:
; CHECK-NEXT: [[TMP6:%.*]] = extractelement <4 x i32> [[PREDPHI]], i32 3
; CHECK-NEXT: br i1 true, label [[FOR_COND_CLEANUP:%.*]], label [[SCALAR_PH]]
; CHECK: scalar.ph:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ 4, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[INC:%.*]], [[COND_END:%.*]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[Y]], 0
; CHECK-NEXT: br i1 [[CMP]], label [[COND_END]], label [[COND_FALSE:%.*]]
; CHECK: cond.false:
; CHECK-NEXT: br label [[COND_END]]
; CHECK: cond.end:
; CHECK-NEXT: [[COND:%.*]] = phi i32 [ 55, [[COND_FALSE]] ], [ [[I]], [[FOR_BODY]] ]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i32 [[INC]], 3
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !llvm.loop !7
; CHECK: for.cond.cleanup:
; CHECK-NEXT: [[COND_LCSSA:%.*]] = phi i32 [ [[COND]], [[COND_END]] ], [ [[TMP6]], [[MIDDLE_BLOCK]] ]
; CHECK-NEXT: ret i32 [[COND_LCSSA]]
;
entry:
br label %for.body
for.body:
%i = phi i32 [ 0, %entry ], [ %inc, %cond.end ]
%cmp = icmp eq i64 %y, 0
br i1 %cmp, label %cond.end, label %cond.false
cond.false:
br label %cond.end
cond.end:
%cond = phi i32 [ 55, %cond.false ], [ %i, %for.body ]
%inc = add nuw nsw i32 %i, 1
%exitcond = icmp eq i32 %inc, 3
br i1 %exitcond, label %for.cond.cleanup, label %for.body
for.cond.cleanup:
ret i32 %cond
}
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