| ; RUN: opt -S < %s -passes=loop-unroll -unroll-count=4 | FileCheck %s |
| ; |
| ; Test induction variable simplify after loop unrolling. It should |
| ; expose nice opportunities for GVN. |
| ; |
| ; CHECK-NOT: while.body also ensures that loop unrolling (with SCEV) |
| ; removes unrolled loop exits given that 128 is a multiple of 4. |
| |
| target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f80:128:128-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32" |
| |
| ; PR10534: LoopUnroll not keeping canonical induction variable... |
| ; CHECK: while.body: |
| ; CHECK-NOT: while.body.1: |
| ; CHECK: %shr.1 = lshr i32 %bit_addr.addr.01, 5 |
| ; CHECK: %arrayidx.1 = getelementptr inbounds i32, ptr %bitmap, i32 %shr.1 |
| ; CHECK: %shr.2 = lshr i32 %bit_addr.addr.01, 5 |
| ; CHECK: %arrayidx.2 = getelementptr inbounds i32, ptr %bitmap, i32 %shr.2 |
| ; CHECK: %shr.3 = lshr i32 %bit_addr.addr.01, 5 |
| ; CHECK: %arrayidx.3 = getelementptr inbounds i32, ptr %bitmap, i32 %shr.3 |
| define void @FlipBit(ptr nocapture %bitmap, i32 %bit_addr, i32 %nbits) nounwind { |
| entry: |
| br label %while.body |
| |
| while.body: |
| %nbits.addr.02 = phi i32 [ 128, %entry ], [ %dec, %while.body ] |
| %bit_addr.addr.01 = phi i32 [ 0, %entry ], [ %inc, %while.body ] |
| %dec = add i32 %nbits.addr.02, -1 |
| %shr = lshr i32 %bit_addr.addr.01, 5 |
| %rem = and i32 %bit_addr.addr.01, 31 |
| %shl = shl i32 1, %rem |
| %arrayidx = getelementptr inbounds i32, ptr %bitmap, i32 %shr |
| %tmp6 = load i32, ptr %arrayidx, align 4 |
| %xor = xor i32 %tmp6, %shl |
| store i32 %xor, ptr %arrayidx, align 4 |
| %inc = add i32 %bit_addr.addr.01, 1 |
| %tobool = icmp eq i32 %dec, 0 |
| br i1 %tobool, label %while.end, label %while.body |
| |
| while.end: |
| ret void |
| } |