Fix vectorization remarks.

This patch changes the vectorization remarks to also inform when
vectorization is possible but not beneficial.

Added tests to exercise some loop remarks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207574 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 67 insertions, 0 deletions

diff --git a/test/Transforms/LoopVectorize/X86/vectorization-remarks.ll b/test/Transforms/LoopVectorize/X86/vectorization-remarks.ll
new file mode 100644
index 0000000000..685d034f21
--- /dev/null
+++ b/test/Transforms/LoopVectorize/X86/vectorization-remarks.ll
@@ -0,0 +1,67 @@
+; RUN: opt < %s -loop-vectorize -mtriple=x86_64-unknown-linux -S -pass-remarks='loop-vectorize' 2>&1 | FileCheck -check-prefix=VECTORIZED %s
+; RUN: opt < %s -loop-vectorize -force-vector-width=1 -force-vector-unroll=4 -mtriple=x86_64-unknown-linux -S -pass-remarks='.*vectorize.*' 2>&1 | FileCheck -check-prefix=UNROLLED %s
+
+; VECTORIZED: remark: {{.*}}.c:17:8: vectorized loop (vectorization factor: 4, unrolling interleave factor: 1)
+; UNROLLED: remark: {{.*}}.c:17:8: unrolled with interleaving factor 4 (vectorization not beneficial)
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+define i32 @foo(i32 %n) #0 {
+entry:
+  %diff = alloca i32, align 4
+  %cb = alloca [16 x i8], align 16
+  %cc = alloca [16 x i8], align 16
+  store i32 0, i32* %diff, align 4, !dbg !10, !tbaa !11
+  br label %for.body, !dbg !15
+
+for.body:                                         ; preds = %for.body, %entry
+  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+  %add8 = phi i32 [ 0, %entry ], [ %add, %for.body ], !dbg !19
+  %arrayidx = getelementptr inbounds [16 x i8]* %cb, i64 0, i64 %indvars.iv, !dbg !19
+  %0 = load i8* %arrayidx, align 1, !dbg !19, !tbaa !21
+  %conv = sext i8 %0 to i32, !dbg !19
+  %arrayidx2 = getelementptr inbounds [16 x i8]* %cc, i64 0, i64 %indvars.iv, !dbg !19
+  %1 = load i8* %arrayidx2, align 1, !dbg !19, !tbaa !21
+  %conv3 = sext i8 %1 to i32, !dbg !19
+  %sub = sub i32 %conv, %conv3, !dbg !19
+  %add = add nsw i32 %sub, %add8, !dbg !19
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !15
+  %exitcond = icmp eq i64 %indvars.iv.next, 16, !dbg !15
+  br i1 %exitcond, label %for.end, label %for.body, !dbg !15
+
+for.end:                                          ; preds = %for.body
+  store i32 %add, i32* %diff, align 4, !dbg !19, !tbaa !11
+  call void @ibar(i32* %diff) #2, !dbg !22
+  ret i32 0, !dbg !23
+}
+
+declare void @ibar(i32*) #1
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!7, !8}
+!llvm.ident = !{!9}
+
+!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.5.0 ", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 2} ; [ DW_TAG_compile_unit ] [./vectorization-remarks.c] [DW_LANG_C99]
+!1 = metadata !{metadata !"vectorization-remarks.c", metadata !"."}
+!2 = metadata !{}
+!3 = metadata !{metadata !4}
+!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"foo", metadata !"foo", metadata !"", i32 5, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, i32 (i32)* @foo, null, null, metadata !2, i32 6} ; [ DW_TAG_subprogram ] [line 5] [def] [scope 6] [foo]
+!5 = metadata !{i32 786473, metadata !1}          ; [ DW_TAG_file_type ] [./vectorization-remarks.c]
+!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !2, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!7 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
+!8 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
+!9 = metadata !{metadata !"clang version 3.5.0 "}
+!10 = metadata !{i32 8, i32 3, metadata !4, null} ; [ DW_TAG_imported_declaration ]
+!11 = metadata !{metadata !12, metadata !12, i64 0}
+!12 = metadata !{metadata !"int", metadata !13, i64 0}
+!13 = metadata !{metadata !"omnipotent char", metadata !14, i64 0}
+!14 = metadata !{metadata !"Simple C/C++ TBAA"}
+!15 = metadata !{i32 17, i32 8, metadata !16, null}
+!16 = metadata !{i32 786443, metadata !1, metadata !17, i32 17, i32 8, i32 2, i32 3} ; [ DW_TAG_lexical_block ] [./vectorization-remarks.c]
+!17 = metadata !{i32 786443, metadata !1, metadata !18, i32 17, i32 8, i32 1, i32 2} ; [ DW_TAG_lexical_block ] [./vectorization-remarks.c]
+!18 = metadata !{i32 786443, metadata !1, metadata !4, i32 17, i32 3, i32 0, i32 0} ; [ DW_TAG_lexical_block ] [./vectorization-remarks.c]
+!19 = metadata !{i32 18, i32 5, metadata !20, null}
+!20 = metadata !{i32 786443, metadata !1, metadata !18, i32 17, i32 27, i32 0, i32 1} ; [ DW_TAG_lexical_block ] [./vectorization-remarks.c]
+!21 = metadata !{metadata !13, metadata !13, i64 0}
+!22 = metadata !{i32 20, i32 3, metadata !4, null}
+!23 = metadata !{i32 21, i32 3, metadata !4, null}