| ; RUN: opt < %s -indvars -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-n32:64" |
| |
| ; Indvars should be able to fold IV increments into shr when low bits are zero. |
| ; |
| ; CHECK-LABEL: @foldIncShr( |
| ; CHECK: shr.1 = lshr i32 %0, 5 |
| define i32 @foldIncShr(i32* %bitmap, i32 %bit_addr, i32 %nbits) nounwind { |
| entry: |
| br label %while.body |
| |
| while.body: |
| %0 = phi i32 [ 0, %entry ], [ %inc.2, %while.body ] |
| %shr = lshr i32 %0, 5 |
| %arrayidx = getelementptr inbounds i32, i32* %bitmap, i32 %shr |
| %tmp6 = load i32, i32* %arrayidx, align 4 |
| %inc.1 = add i32 %0, 1 |
| %shr.1 = lshr i32 %inc.1, 5 |
| %arrayidx.1 = getelementptr inbounds i32, i32* %bitmap, i32 %shr.1 |
| %tmp6.1 = load i32, i32* %arrayidx.1, align 4 |
| %inc.2 = add i32 %inc.1, 1 |
| %exitcond.3 = icmp eq i32 %inc.2, 128 |
| br i1 %exitcond.3, label %while.end, label %while.body |
| |
| while.end: |
| %r = add i32 %tmp6, %tmp6.1 |
| ret i32 %r |
| } |
| |
| ; Invdars should not fold an increment into shr unless 2^shiftBits is |
| ; a multiple of the recurrence step. |
| ; |
| ; CHECK-LABEL: @noFoldIncShr( |
| ; CHECK: shr.1 = lshr i32 %inc.1, 5 |
| define i32 @noFoldIncShr(i32* %bitmap, i32 %bit_addr, i32 %nbits) nounwind { |
| entry: |
| br label %while.body |
| |
| while.body: |
| %0 = phi i32 [ 0, %entry ], [ %inc.3, %while.body ] |
| %shr = lshr i32 %0, 5 |
| %arrayidx = getelementptr inbounds i32, i32* %bitmap, i32 %shr |
| %tmp6 = load i32, i32* %arrayidx, align 4 |
| %inc.1 = add i32 %0, 1 |
| %shr.1 = lshr i32 %inc.1, 5 |
| %arrayidx.1 = getelementptr inbounds i32, i32* %bitmap, i32 %shr.1 |
| %tmp6.1 = load i32, i32* %arrayidx.1, align 4 |
| %inc.3 = add i32 %inc.1, 2 |
| %exitcond.3 = icmp eq i32 %inc.3, 96 |
| br i1 %exitcond.3, label %while.end, label %while.body |
| |
| while.end: |
| %r = add i32 %tmp6, %tmp6.1 |
| ret i32 %r |
| } |