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