41 lines
1.6 KiB
LLVM
41 lines
1.6 KiB
LLVM
|
; 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
|
||
|
|
}
|