blob: c573227af07fd3bbc52173c0de609ebc72f4a8d7 [file] [log] [blame]
; RUN: llc -march=hexagon -rdf-opt=0 < %s | FileCheck %s
; Test that we fixup a pipelined loop correctly when the number of
; stages is greater than the compile-time loop trip count. In this
; test, there are two prolog stages, but the loop executes only once.
; In the bug, the final CFG contains two iterations of the loop.
; CHECK-NOT: loop0
; CHECK: = mpy
; CHECK-NOT: = mpy
define void @f0() {
b0:
br label %b1
b1: ; preds = %b1, %b0
%v0 = phi i32 [ 0, %b0 ], [ %v9, %b1 ]
%v1 = phi i32 [ 0, %b0 ], [ %v8, %b1 ]
%v2 = load i32, i32* undef, align 4
%v3 = add nsw i32 %v1, 1
%v4 = srem i32 %v2, 3
%v5 = icmp ne i32 %v4, 0
%v6 = sub nsw i32 0, %v2
%v7 = select i1 %v5, i32 %v6, i32 %v2
%v8 = mul nsw i32 %v3, %v7
%v9 = add nsw i32 %v0, 1
%v10 = icmp eq i32 %v9, 1
br i1 %v10, label %b2, label %b1
b2: ; preds = %b1
%v11 = phi i32 [ %v8, %b1 ]
br label %b3
b3: ; preds = %b3, %b2
br label %b3
}