| ; RUN: opt < %s -indvars -S | FileCheck %s |
| ; |
| ; Prior to the fix for PR11375, indvars would replace %firstIV with a |
| ; loop-invariant gep computed in the preheader. This was incorrect |
| ; because it was based on the minimum "ExitNotTaken" count. If the |
| ; final loop test is skipped (odd number of elements) then the early |
| ; exit would be taken and the loop invariant value would be incorrect. |
| |
| 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" |
| target triple = "x86_64-apple-darwin" |
| |
| ; CHECK: if.end: |
| ; CHECK: phi i32* [ %first.lcssa, %early.exit ] |
| define i32 @test(i32* %first, i32* %last) uwtable ssp { |
| entry: |
| br i1 undef, label %if.end, label %if.then |
| |
| if.then: ; preds = %entry |
| br i1 undef, label %if.end, label %do.body |
| |
| do.body: ; preds = %if.else, %if.then |
| %firstIV = phi i32* [ %incdec.ptr2, %if.else ], [ %first, %if.then ] |
| %incdec.ptr1 = getelementptr inbounds i32, i32* %firstIV, i64 1 |
| %cmp1 = icmp eq i32* %incdec.ptr1, %last |
| br i1 %cmp1, label %early.exit, label %if.else |
| |
| if.else: ; preds = %do.body |
| %incdec.ptr2 = getelementptr inbounds i32, i32* %firstIV, i64 2 |
| %cmp2 = icmp eq i32* %incdec.ptr2, %last |
| br i1 %cmp2, label %if.end, label %do.body |
| |
| early.exit: |
| %first.lcssa = phi i32* [ %firstIV, %do.body ] |
| br label %if.end |
| |
| if.end: |
| %tmp = phi i32* [ %first.lcssa, %early.exit ], [ %first, %if.then ], [ %first, %entry ], [ undef, %if.else ] |
| %val = load i32, i32* %tmp |
| ret i32 %val |
| } |
