| ; REQUIRES: asserts |
| ; RUN: opt < %s -passes='loop(loop-interchange),simplifycfg' -cache-line-size=64 -simplifycfg-require-and-preserve-domtree=1 -pass-remarks-output=%t \ |
| ; RUN: -pass-remarks=loop-interchange -pass-remarks-missed=loop-interchange -stats -S 2>&1 \ |
| ; RUN: | FileCheck -check-prefix=STATS %s |
| ; RUN: FileCheck -input-file %t %s |
| |
| |
| ; no_deps_interchange just accesses a single nested array and can be interchange. |
| ; CHECK: Name: Interchanged |
| ; CHECK-NEXT: Function: no_deps_interchange |
| define i32 @no_deps_interchange(ptr nocapture %Arr) local_unnamed_addr #0 { |
| entry: |
| br label %for1.header |
| |
| for1.header: ; preds = %entry, %for1.inc |
| %indvars.iv19 = phi i64 [ 0, %entry ], [ %indvars.iv.next20, %for1.inc ] |
| br label %for2 |
| |
| for2: ; preds = %for1.header, %for2 |
| %indvars.iv = phi i64 [ 0, %for1.header ], [ %indvars.iv.next, %for2 ] |
| %arrayidx6 = getelementptr inbounds [1024 x i32], ptr %Arr, i64 %indvars.iv, i64 %indvars.iv19 |
| store i32 0, ptr %arrayidx6, align 4 |
| %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 |
| %exitcond = icmp ne i64 %indvars.iv.next, 1024 |
| br i1 %exitcond, label %for2, label %for1.inc |
| |
| for1.inc: |
| %indvars.iv.next20 = add nuw nsw i64 %indvars.iv19, 1 |
| %exitcond21 = icmp ne i64 %indvars.iv.next20, 1024 |
| br i1 %exitcond21, label %for1.header, label %exit |
| |
| exit: ; preds = %for1.inc |
| ret i32 0 |
| |
| } |
| |
| ; No memory access using any induction variables, interchanging not beneficial. |
| ; CHECK: Name: InterchangeNotProfitable |
| ; CHECK-NEXT: Function: no_mem_instrs |
| define i32 @no_mem_instrs(ptr %ptr) { |
| entry: |
| br label %for1.header |
| |
| for1.header: ; preds = %entry, %for1.inc |
| %indvars.iv19 = phi i64 [ 0, %entry ], [ %indvars.iv.next20, %for1.inc ] |
| br label %for2 |
| |
| for2: ; preds = %for1.header, %for2 |
| %indvars.iv = phi i64 [ 0, %for1.header ], [ %indvars.iv.next, %for2 ] |
| store i64 %indvars.iv, ptr %ptr, align 4 |
| %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 |
| %exitcond = icmp ne i64 %indvars.iv.next, 1024 |
| br i1 %exitcond, label %for2, label %for1.inc |
| |
| for1.inc: |
| %indvars.iv.next20 = add nuw nsw i64 %indvars.iv19, 1 |
| %exitcond21 = icmp ne i64 %indvars.iv.next20, 1024 |
| br i1 %exitcond21, label %for1.header, label %exit |
| |
| exit: ; preds = %for1.inc |
| ret i32 0 |
| } |
| |
| |
| ; Check stats, we interchanged 1 out of 3 loops. |
| ; STATS: 1 loop-interchange - Number of loops interchanged |
