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Add an additional testcase for PR15882.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181646 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2013-05-10 22:55:44 +00:00
parent 46090914b7
commit ef3e423e23
1 changed files with 45 additions and 0 deletions
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45
test/Transforms/LoopVectorize/reverse_iter.ll Normal file
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; RUN: opt < %s -loop-vectorize -force-vector-unroll=1 -force-vector-width=4 -dce -instcombine -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"
target triple = "x86_64-apple-macosx10.8.0"
; Make sure that the reverse iterators are calculated using 64bit arithmetic, not 32.
;
; int foo(int n, int *A) {
; int sum;
; for (int i=n; i > 0; i--)
; sum += A[i*2];
; return sum;
; }
;
;CHECK: @foo
;CHECK: <i64 0, i64 -1, i64 -2, i64 -3>
;CHECK: ret
define i32 @foo(i32 %n, i32* nocapture %A) {
%1 = icmp sgt i32 %n, 0
br i1 %1, label %.lr.ph, label %._crit_edge
.lr.ph: ; preds = %0
%2 = sext i32 %n to i64
br label %3
; <label>:3 ; preds = %.lr.ph, %3
%indvars.iv = phi i64 [ %2, %.lr.ph ], [ %indvars.iv.next, %3 ]
%sum.01 = phi i32 [ undef, %.lr.ph ], [ %9, %3 ]
%4 = trunc i64 %indvars.iv to i32
%5 = shl nsw i32 %4, 1
%6 = sext i32 %5 to i64
%7 = getelementptr inbounds i32* %A, i64 %6
%8 = load i32* %7, align 4
%9 = add nsw i32 %8, %sum.01
%indvars.iv.next = add i64 %indvars.iv, -1
%10 = trunc i64 %indvars.iv.next to i32
%11 = icmp sgt i32 %10, 0
br i1 %11, label %3, label %._crit_edge
._crit_edge: ; preds = %3, %0
%sum.0.lcssa = phi i32 [ undef, %0 ], [ %9, %3 ]
ret i32 %sum.0.lcssa
}