| Arnold Schwaighofer | 2d92047 | 2013-05-15 01:44:30 +0000 | [diff] [blame] | 1 | ; RUN: opt -loop-vectorize -force-vector-width=2 -force-vector-unroll=1 -S < %s | FileCheck %s |
| 2 | |
| 3 | 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" |
| 4 | |
| 5 | @A = common global [1024 x float] zeroinitializer, align 16 |
| 6 | @B = common global [1024 x float] zeroinitializer, align 16 |
| 7 | |
| 8 | ; Make sure we can vectorize in the presence of hoistable conditional loads. |
| Matt Arsenault | e64c7c7 | 2013-10-02 20:29:00 +0000 | [diff] [blame] | 9 | ; CHECK-LABEL: @hoist_cond_load( |
| Arnold Schwaighofer | 2d92047 | 2013-05-15 01:44:30 +0000 | [diff] [blame] | 10 | ; CHECK: load <2 x float> |
| 11 | |
| 12 | define void @hoist_cond_load() { |
| 13 | entry: |
| 14 | br label %for.body |
| 15 | for.body: |
| 16 | %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %if.end9 ] |
| 17 | %arrayidx = getelementptr inbounds [1024 x float]* @A, i64 0, i64 %indvars.iv |
| 18 | %arrayidx2 = getelementptr inbounds [1024 x float]* @B, i64 0, i64 %indvars.iv |
| 19 | %0 = load float* %arrayidx2, align 4 |
| 20 | %cmp3 = fcmp oeq float %0, 0.000000e+00 |
| 21 | br i1 %cmp3, label %if.end9, label %if.else |
| 22 | |
| 23 | if.else: |
| 24 | %1 = load float* %arrayidx, align 4 |
| 25 | br label %if.end9 |
| 26 | |
| 27 | if.end9: |
| 28 | %tmp.0 = phi float [ %1, %if.else ], [ 0.000000e+00, %for.body ] |
| 29 | store float %tmp.0, float* %arrayidx, align 4 |
| 30 | %indvars.iv.next = add i64 %indvars.iv, 1 |
| 31 | %lftr.wideiv = trunc i64 %indvars.iv.next to i32 |
| 32 | %exitcond = icmp ne i32 %lftr.wideiv, 1024 |
| 33 | br i1 %exitcond, label %for.body, label %for.end |
| 34 | |
| 35 | for.end: |
| 36 | ret void |
| 37 | } |
| 38 | |
| 39 | ; However, we can't hoist loads whose address we have not seen unconditionally |
| 40 | ; accessed. |
| Matt Arsenault | e64c7c7 | 2013-10-02 20:29:00 +0000 | [diff] [blame] | 41 | ; CHECK-LABEL: @dont_hoist_cond_load( |
| Arnold Schwaighofer | 2d92047 | 2013-05-15 01:44:30 +0000 | [diff] [blame] | 42 | ; CHECK-NOT: load <2 x float> |
| 43 | |
| 44 | define void @dont_hoist_cond_load() { |
| 45 | entry: |
| 46 | br label %for.body |
| 47 | for.body: |
| 48 | %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %if.end9 ] |
| 49 | %arrayidx = getelementptr inbounds [1024 x float]* @A, i64 0, i64 %indvars.iv |
| 50 | %arrayidx2 = getelementptr inbounds [1024 x float]* @B, i64 0, i64 %indvars.iv |
| 51 | %0 = load float* %arrayidx2, align 4 |
| 52 | %cmp3 = fcmp oeq float %0, 0.000000e+00 |
| 53 | br i1 %cmp3, label %if.end9, label %if.else |
| 54 | |
| 55 | if.else: |
| 56 | %1 = load float* %arrayidx, align 4 |
| 57 | br label %if.end9 |
| 58 | |
| 59 | if.end9: |
| 60 | %tmp.0 = phi float [ %1, %if.else ], [ 0.000000e+00, %for.body ] |
| 61 | store float %tmp.0, float* %arrayidx2, align 4 |
| 62 | %indvars.iv.next = add i64 %indvars.iv, 1 |
| 63 | %lftr.wideiv = trunc i64 %indvars.iv.next to i32 |
| 64 | %exitcond = icmp ne i32 %lftr.wideiv, 1024 |
| 65 | br i1 %exitcond, label %for.body, label %for.end |
| 66 | |
| 67 | for.end: |
| 68 | ret void |
| 69 | } |