1 ; RUN: opt < %s -indvars -S | FileCheck %s 2 ; 3 ; Make sure IndVars preserves LCSSA form, especially across loop nests. 4 5 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" 6 7 define void @PR18642(i32 %x) { 8 ; CHECK-LABEL: @PR18642( 9 entry: 10 br label %outer.header 11 ; CHECK: br label %outer.header 12 13 outer.header: 14 ; CHECK: outer.header: 15 %outer.iv = phi i32 [ 0, %entry ], [ %x, %outer.latch ] 16 br label %inner.header 17 ; CHECK: %[[SCEV_EXPANDED:.*]] = add i32 18 ; CHECK: br label %inner.header 19 20 inner.header: 21 ; CHECK: inner.header: 22 %inner.iv = phi i32 [ undef, %outer.header ], [ %inc, %inner.latch ] 23 %cmp1 = icmp slt i32 %inner.iv, %outer.iv 24 br i1 %cmp1, label %inner.latch, label %outer.latch 25 ; CHECK: br i1 {{.*}}, label %inner.latch, label %outer.latch 26 27 inner.latch: 28 ; CHECK: inner.latch: 29 %inc = add nsw i32 %inner.iv, 1 30 %cmp2 = icmp slt i32 %inner.iv, %outer.iv 31 br i1 %cmp2, label %inner.header, label %exit 32 ; CHECK: br i1 {{.*}}, label %inner.header, label %[[EXIT_FROM_INNER:.*]] 33 34 outer.latch: 35 ; CHECK: outer.latch: 36 br i1 undef, label %outer.header, label %exit 37 ; CHECK: br i1 {{.*}}, label %outer.header, label %[[EXIT_FROM_OUTER:.*]] 38 39 ; CHECK: [[EXIT_FROM_INNER]]: 40 ; CHECK-NEXT: %[[LCSSA:.*]] = phi i32 [ %[[SCEV_EXPANDED]], %inner.latch ] 41 ; CHECK-NEXT: br label %exit 42 43 ; CHECK: [[EXIT_FROM_OUTER]]: 44 ; CHECK-NEXT: br label %exit 45 46 exit: 47 ; CHECK: exit: 48 %exit.phi = phi i32 [ %inc, %inner.latch ], [ undef, %outer.latch ] 49 ; CHECK-NEXT: phi i32 [ %[[LCSSA]], %[[EXIT_FROM_INNER]] ], [ undef, %[[EXIT_FROM_OUTER]] ] 50 ret void 51 } 52
