1 ; RUN: opt < %s -passes=indvars -S | FileCheck %s
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.
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"
13 ; CHECK: phi ptr [ %first.lcssa, %early.exit ]
14 define i32 @test(ptr %first, ptr %last) uwtable ssp {
16 br i1 undef, label %if.end, label %if.then
18 if.then: ; preds = %entry
19 br i1 undef, label %if.end, label %do.body
21 do.body: ; preds = %if.else, %if.then
22 %firstIV = phi ptr [ %incdec.ptr2, %if.else ], [ %first, %if.then ]
23 %incdec.ptr1 = getelementptr inbounds i32, ptr %firstIV, i64 1
24 %cmp1 = icmp eq ptr %incdec.ptr1, %last
25 br i1 %cmp1, label %early.exit, label %if.else
27 if.else: ; preds = %do.body
28 %incdec.ptr2 = getelementptr inbounds i32, ptr %firstIV, i64 2
29 %cmp2 = icmp eq ptr %incdec.ptr2, %last
30 br i1 %cmp2, label %if.end, label %do.body
33 %first.lcssa = phi ptr [ %firstIV, %do.body ]
37 %tmp = phi ptr [ %first.lcssa, %early.exit ], [ %first, %if.then ], [ %first, %entry ], [ undef, %if.else ]
38 %val = load i32, ptr %tmp