llvm/llvm/test/Transforms/LoopVectorize/struct_access.ll

; RUN: opt < %s -passes=loop-vectorize,instcombine -force-vector-interleave=1 -force-vector-width=4 -S | FileCheck %s

target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"

%struct.coordinate = type { i32, i32 }

; Make sure that we don't generate a wide load when accessing the struct.
; struct coordinate {
;  int x;
;  int y;
; };
;
;
; int foo(struct coordinate *A, int n) {
;
;   int sum = 0;
;   for (int i = 0; i < n; ++i)
;     sum += A[i].x;
;
;   return sum;
; }

;CHECK-LABEL: @foo(
;CHECK-NOT: load <4 x i32>
;CHECK: ret
define i32 @foo(ptr nocapture %A, i32 %n) nounwind uwtable readonly ssp {
entry:
  %cmp4 = icmp sgt i32 %n, 0
  br i1 %cmp4, label %for.body, label %for.end

for.body:                                         ; preds = %entry, %for.body
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
  %sum.05 = phi i32 [ %add, %for.body ], [ 0, %entry ]
  %x = getelementptr inbounds %struct.coordinate, ptr %A, i64 %indvars.iv, i32 0
  %0 = load i32, ptr %x, align 4
  %add = add nsw i32 %0, %sum.05
  %indvars.iv.next = add i64 %indvars.iv, 1
  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
  %exitcond = icmp eq i32 %lftr.wideiv, %n
  br i1 %exitcond, label %for.end, label %for.body

for.end:                                          ; preds = %for.body, %entry
  %sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
  ret i32 %sum.0.lcssa
}

%struct.lit = type { i32 }

; Verify that we still vectorize the access if the struct has the same size as
; the loaded element.
; struct lit {
;  int x;
; };
;
;
; int bar(struct lit *A, int n) {
;
;   int sum = 0;
;   for (int i = 0; i < n; ++i)
;     sum += A[i].x;
;
;   return sum;
; }

;CHECK-LABEL: @bar(
;CHECK: load <4 x i32>
;CHECK: ret
define i32 @bar(ptr nocapture %A, i32 %n) nounwind uwtable readonly ssp {
entry:
  %cmp4 = icmp sgt i32 %n, 0
  br i1 %cmp4, label %for.body, label %for.end

for.body:                                         ; preds = %entry, %for.body
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
  %sum.05 = phi i32 [ %add, %for.body ], [ 0, %entry ]
  %x = getelementptr inbounds %struct.lit, ptr %A, i64 %indvars.iv, i32 0
  %0 = load i32, ptr %x, align 4
  %add = add nsw i32 %0, %sum.05
  %indvars.iv.next = add i64 %indvars.iv, 1
  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
  %exitcond = icmp eq i32 %lftr.wideiv, %n
  br i1 %exitcond, label %for.end, label %for.body

for.end:                                          ; preds = %for.body, %entry
  %sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
  ret i32 %sum.0.lcssa
}