| 12345678910111213141516171819202122232425262728293031323334353637383940 |
- ; 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
- }
|
