1 ; RUN: opt < %s -indvars -S | FileCheck %s 2 ; 3 ; Prior to the fix for PR11375, indvars would replace %firstIV with a 4 ; loop-invariant gep computed in the preheader. This was incorrect 5 ; because it was based on the minimum "ExitNotTaken" count. If the 6 ; final loop test is skipped (odd number of elements) then the early 7 ; exit would be taken and the loop invariant value would be incorrect. 8 9 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" 10 target triple = "x86_64-apple-darwin" 11 12 ; CHECK: if.end: 13 ; CHECK: phi i32* [ %first.lcssa, %early.exit ] 14 define i32 @test(i32* %first, i32* %last) uwtable ssp { 15 entry: 16 br i1 undef, label %if.end, label %if.then 17 18 if.then: ; preds = %entry 19 br i1 undef, label %if.end, label %do.body 20 21 do.body: ; preds = %if.else, %if.then 22 %firstIV = phi i32* [ %incdec.ptr2, %if.else ], [ %first, %if.then ] 23 %incdec.ptr1 = getelementptr inbounds i32* %firstIV, i64 1 24 %cmp1 = icmp eq i32* %incdec.ptr1, %last 25 br i1 %cmp1, label %early.exit, label %if.else 26 27 if.else: ; preds = %do.body 28 %incdec.ptr2 = getelementptr inbounds i32* %firstIV, i64 2 29 %cmp2 = icmp eq i32* %incdec.ptr2, %last 30 br i1 %cmp2, label %if.end, label %do.body 31 32 early.exit: 33 %first.lcssa = phi i32* [ %firstIV, %do.body ] 34 br label %if.end 35 36 if.end: 37 %tmp = phi i32* [ %first.lcssa, %early.exit ], [ %first, %if.then ], [ %first, %entry ], [ undef, %if.else ] 38 %val = load i32* %tmp 39 ret i32 %val 40 } 41
