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llvm-mirror/test/Transforms/IndVarSimplify/2011-11-01-lftrptr.ll
Eli Friedman 19ad020e28 [ScalarEvolution] Ensure backedge-taken counts are not pointers. 
A backedge-taken count doesn't refer to memory; returning a pointer type
is nonsense. So make sure we always return an integer.

The obvious way to do this would be to just convert the operands of the
icmp to integers, but that doesn't quite work out at the moment:
isLoopEntryGuardedByCond currently gets confused by ptrtoint operations.
So we perform the ptrtoint conversion late for lt/gt operations.

The test changes are mostly innocuous. The most interesting changes are
more complex SCEV expressions of the form "(-1 * (ptrtoint i8* %ptr to
i64)) + %ptr)". This is expected: we can't fold this to zero because we
need to preserve the pointer base.

The call to isLoopEntryGuardedByCond in howFarToZero is less precise
because of ptrtoint operations; this shows up in the function
pr46786_c26_char in ptrtoint.ll. Fixing it here would require more
complex refactoring.  It should eventually be fixed by future
improvements to isImpliedCond.

See https://bugs.llvm.org/show_bug.cgi?id=46786 for context.

Differential Revision: https://reviews.llvm.org/D103656
2021-06-21 16:24:16 -07:00

360 lines
15 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -indvars -S "-data-layout=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" | FileCheck -check-prefix=PTR64 %s
; RUN: opt < %s -indvars -S "-data-layout=e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32" | FileCheck -check-prefix=PTR32 %s
;
; PR11279: Assertion !IVLimit->getType()->isPointerTy()
;
; Test LinearFunctionTestReplace of a pointer-type loop counter. Note
; that BECount may or may not be a pointer type. A pointer type
; BECount doesn't really make sense, but that's what falls out of
; SCEV. Since it's an i8*, it has unit stride so we never adjust the
; SCEV expression in a way that would convert it to an integer type.
define i8 @testnullptrptr(i8* %buf, i8* %end) nounwind {
; PTR64-LABEL: @testnullptrptr(
; PTR64-NEXT: [[END1:%.*]] = ptrtoint i8* [[END:%.*]] to i64
; PTR64-NEXT: br label [[LOOPGUARD:%.*]]
; PTR64: loopguard:
; PTR64-NEXT: [[GUARD:%.*]] = icmp ult i8* null, [[END]]
; PTR64-NEXT: br i1 [[GUARD]], label [[PREHEADER:%.*]], label [[EXIT:%.*]]
; PTR64: preheader:
; PTR64-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, i8* null, i64 [[END1]]
; PTR64-NEXT: br label [[LOOP:%.*]]
; PTR64: loop:
; PTR64-NEXT: [[P_01_US_US:%.*]] = phi i8* [ null, [[PREHEADER]] ], [ [[GEP:%.*]], [[LOOP]] ]
; PTR64-NEXT: [[GEP]] = getelementptr inbounds i8, i8* [[P_01_US_US]], i64 1
; PTR64-NEXT: [[SNEXT:%.*]] = load i8, i8* [[GEP]], align 1
; PTR64-NEXT: [[EXITCOND:%.*]] = icmp ne i8* [[GEP]], [[SCEVGEP]]
; PTR64-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
; PTR64: exit.loopexit:
; PTR64-NEXT: [[SNEXT_LCSSA:%.*]] = phi i8 [ [[SNEXT]], [[LOOP]] ]
; PTR64-NEXT: br label [[EXIT]]
; PTR64: exit:
; PTR64-NEXT: [[RET:%.*]] = phi i8 [ 0, [[LOOPGUARD]] ], [ [[SNEXT_LCSSA]], [[EXIT_LOOPEXIT]] ]
; PTR64-NEXT: ret i8 [[RET]]
;
; PTR32-LABEL: @testnullptrptr(
; PTR32-NEXT: [[END1:%.*]] = ptrtoint i8* [[END:%.*]] to i32
; PTR32-NEXT: br label [[LOOPGUARD:%.*]]
; PTR32: loopguard:
; PTR32-NEXT: [[GUARD:%.*]] = icmp ult i8* null, [[END]]
; PTR32-NEXT: br i1 [[GUARD]], label [[PREHEADER:%.*]], label [[EXIT:%.*]]
; PTR32: preheader:
; PTR32-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, i8* null, i32 [[END1]]
; PTR32-NEXT: br label [[LOOP:%.*]]
; PTR32: loop:
; PTR32-NEXT: [[P_01_US_US:%.*]] = phi i8* [ null, [[PREHEADER]] ], [ [[GEP:%.*]], [[LOOP]] ]
; PTR32-NEXT: [[GEP]] = getelementptr inbounds i8, i8* [[P_01_US_US]], i64 1
; PTR32-NEXT: [[SNEXT:%.*]] = load i8, i8* [[GEP]], align 1
; PTR32-NEXT: [[EXITCOND:%.*]] = icmp ne i8* [[GEP]], [[SCEVGEP]]
; PTR32-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
; PTR32: exit.loopexit:
; PTR32-NEXT: [[SNEXT_LCSSA:%.*]] = phi i8 [ [[SNEXT]], [[LOOP]] ]
; PTR32-NEXT: br label [[EXIT]]
; PTR32: exit:
; PTR32-NEXT: [[RET:%.*]] = phi i8 [ 0, [[LOOPGUARD]] ], [ [[SNEXT_LCSSA]], [[EXIT_LOOPEXIT]] ]
; PTR32-NEXT: ret i8 [[RET]]
;
br label %loopguard
loopguard:
%guard = icmp ult i8* null, %end
br i1 %guard, label %preheader, label %exit
preheader:
br label %loop
loop:
%p.01.us.us = phi i8* [ null, %preheader ], [ %gep, %loop ]
%s = phi i8 [0, %preheader], [%snext, %loop]
%gep = getelementptr inbounds i8, i8* %p.01.us.us, i64 1
%snext = load i8, i8* %gep
%cmp = icmp ult i8* %gep, %end
br i1 %cmp, label %loop, label %exit
exit:
%ret = phi i8 [0, %loopguard], [%snext, %loop]
ret i8 %ret
}
define i8 @testptrptr(i8* %buf, i8* %end) nounwind {
; PTR64-LABEL: @testptrptr(
; PTR64-NEXT: [[BUF2:%.*]] = ptrtoint i8* [[BUF:%.*]] to i64
; PTR64-NEXT: [[END1:%.*]] = ptrtoint i8* [[END:%.*]] to i64
; PTR64-NEXT: br label [[LOOPGUARD:%.*]]
; PTR64: loopguard:
; PTR64-NEXT: [[GUARD:%.*]] = icmp ult i8* [[BUF]], [[END]]
; PTR64-NEXT: br i1 [[GUARD]], label [[PREHEADER:%.*]], label [[EXIT:%.*]]
; PTR64: preheader:
; PTR64-NEXT: [[TMP1:%.*]] = sub i64 [[END1]], [[BUF2]]
; PTR64-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, i8* [[BUF]], i64 [[TMP1]]
; PTR64-NEXT: br label [[LOOP:%.*]]
; PTR64: loop:
; PTR64-NEXT: [[P_01_US_US:%.*]] = phi i8* [ [[BUF]], [[PREHEADER]] ], [ [[GEP:%.*]], [[LOOP]] ]
; PTR64-NEXT: [[GEP]] = getelementptr inbounds i8, i8* [[P_01_US_US]], i64 1
; PTR64-NEXT: [[SNEXT:%.*]] = load i8, i8* [[GEP]], align 1
; PTR64-NEXT: [[EXITCOND:%.*]] = icmp ne i8* [[GEP]], [[SCEVGEP]]
; PTR64-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
; PTR64: exit.loopexit:
; PTR64-NEXT: [[SNEXT_LCSSA:%.*]] = phi i8 [ [[SNEXT]], [[LOOP]] ]
; PTR64-NEXT: br label [[EXIT]]
; PTR64: exit:
; PTR64-NEXT: [[RET:%.*]] = phi i8 [ 0, [[LOOPGUARD]] ], [ [[SNEXT_LCSSA]], [[EXIT_LOOPEXIT]] ]
; PTR64-NEXT: ret i8 [[RET]]
;
; PTR32-LABEL: @testptrptr(
; PTR32-NEXT: [[BUF2:%.*]] = ptrtoint i8* [[BUF:%.*]] to i32
; PTR32-NEXT: [[END1:%.*]] = ptrtoint i8* [[END:%.*]] to i32
; PTR32-NEXT: br label [[LOOPGUARD:%.*]]
; PTR32: loopguard:
; PTR32-NEXT: [[GUARD:%.*]] = icmp ult i8* [[BUF]], [[END]]
; PTR32-NEXT: br i1 [[GUARD]], label [[PREHEADER:%.*]], label [[EXIT:%.*]]
; PTR32: preheader:
; PTR32-NEXT: [[TMP1:%.*]] = sub i32 [[END1]], [[BUF2]]
; PTR32-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, i8* [[BUF]], i32 [[TMP1]]
; PTR32-NEXT: br label [[LOOP:%.*]]
; PTR32: loop:
; PTR32-NEXT: [[P_01_US_US:%.*]] = phi i8* [ [[BUF]], [[PREHEADER]] ], [ [[GEP:%.*]], [[LOOP]] ]
; PTR32-NEXT: [[GEP]] = getelementptr inbounds i8, i8* [[P_01_US_US]], i64 1
; PTR32-NEXT: [[SNEXT:%.*]] = load i8, i8* [[GEP]], align 1
; PTR32-NEXT: [[EXITCOND:%.*]] = icmp ne i8* [[GEP]], [[SCEVGEP]]
; PTR32-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
; PTR32: exit.loopexit:
; PTR32-NEXT: [[SNEXT_LCSSA:%.*]] = phi i8 [ [[SNEXT]], [[LOOP]] ]
; PTR32-NEXT: br label [[EXIT]]
; PTR32: exit:
; PTR32-NEXT: [[RET:%.*]] = phi i8 [ 0, [[LOOPGUARD]] ], [ [[SNEXT_LCSSA]], [[EXIT_LOOPEXIT]] ]
; PTR32-NEXT: ret i8 [[RET]]
;
br label %loopguard
loopguard:
%guard = icmp ult i8* %buf, %end
br i1 %guard, label %preheader, label %exit
preheader:
br label %loop
loop:
%p.01.us.us = phi i8* [ %buf, %preheader ], [ %gep, %loop ]
%s = phi i8 [0, %preheader], [%snext, %loop]
%gep = getelementptr inbounds i8, i8* %p.01.us.us, i64 1
%snext = load i8, i8* %gep
%cmp = icmp ult i8* %gep, %end
br i1 %cmp, label %loop, label %exit
exit:
%ret = phi i8 [0, %loopguard], [%snext, %loop]
ret i8 %ret
}
define i8 @testnullptrint(i8* %buf, i8* %end) nounwind {
; PTR64-LABEL: @testnullptrint(
; PTR64-NEXT: br label [[LOOPGUARD:%.*]]
; PTR64: loopguard:
; PTR64-NEXT: [[BI:%.*]] = ptrtoint i8* [[BUF:%.*]] to i32
; PTR64-NEXT: [[EI:%.*]] = ptrtoint i8* [[END:%.*]] to i32
; PTR64-NEXT: [[CNT:%.*]] = sub i32 [[EI]], [[BI]]
; PTR64-NEXT: [[GUARD:%.*]] = icmp ult i32 0, [[CNT]]
; PTR64-NEXT: br i1 [[GUARD]], label [[PREHEADER:%.*]], label [[EXIT:%.*]]
; PTR64: preheader:
; PTR64-NEXT: [[TMP1:%.*]] = add i32 [[EI]], -1
; PTR64-NEXT: [[TMP2:%.*]] = sub i32 [[TMP1]], [[BI]]
; PTR64-NEXT: [[TMP3:%.*]] = zext i32 [[TMP2]] to i64
; PTR64-NEXT: [[TMP4:%.*]] = add nuw nsw i64 [[TMP3]], 1
; PTR64-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, i8* null, i64 [[TMP4]]
; PTR64-NEXT: br label [[LOOP:%.*]]
; PTR64: loop:
; PTR64-NEXT: [[P_01_US_US:%.*]] = phi i8* [ null, [[PREHEADER]] ], [ [[GEP:%.*]], [[LOOP]] ]
; PTR64-NEXT: [[GEP]] = getelementptr inbounds i8, i8* [[P_01_US_US]], i64 1
; PTR64-NEXT: [[SNEXT:%.*]] = load i8, i8* [[GEP]], align 1
; PTR64-NEXT: [[EXITCOND:%.*]] = icmp ne i8* [[GEP]], [[SCEVGEP]]
; PTR64-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
; PTR64: exit.loopexit:
; PTR64-NEXT: [[SNEXT_LCSSA:%.*]] = phi i8 [ [[SNEXT]], [[LOOP]] ]
; PTR64-NEXT: br label [[EXIT]]
; PTR64: exit:
; PTR64-NEXT: [[RET:%.*]] = phi i8 [ 0, [[LOOPGUARD]] ], [ [[SNEXT_LCSSA]], [[EXIT_LOOPEXIT]] ]
; PTR64-NEXT: ret i8 [[RET]]
;
; PTR32-LABEL: @testnullptrint(
; PTR32-NEXT: br label [[LOOPGUARD:%.*]]
; PTR32: loopguard:
; PTR32-NEXT: [[BI:%.*]] = ptrtoint i8* [[BUF:%.*]] to i32
; PTR32-NEXT: [[EI:%.*]] = ptrtoint i8* [[END:%.*]] to i32
; PTR32-NEXT: [[CNT:%.*]] = sub i32 [[EI]], [[BI]]
; PTR32-NEXT: [[GUARD:%.*]] = icmp ult i32 0, [[CNT]]
; PTR32-NEXT: br i1 [[GUARD]], label [[PREHEADER:%.*]], label [[EXIT:%.*]]
; PTR32: preheader:
; PTR32-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, i8* null, i32 [[CNT]]
; PTR32-NEXT: br label [[LOOP:%.*]]
; PTR32: loop:
; PTR32-NEXT: [[P_01_US_US:%.*]] = phi i8* [ null, [[PREHEADER]] ], [ [[GEP:%.*]], [[LOOP]] ]
; PTR32-NEXT: [[GEP]] = getelementptr inbounds i8, i8* [[P_01_US_US]], i64 1
; PTR32-NEXT: [[SNEXT:%.*]] = load i8, i8* [[GEP]], align 1
; PTR32-NEXT: [[EXITCOND:%.*]] = icmp ne i8* [[GEP]], [[SCEVGEP]]
; PTR32-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
; PTR32: exit.loopexit:
; PTR32-NEXT: [[SNEXT_LCSSA:%.*]] = phi i8 [ [[SNEXT]], [[LOOP]] ]
; PTR32-NEXT: br label [[EXIT]]
; PTR32: exit:
; PTR32-NEXT: [[RET:%.*]] = phi i8 [ 0, [[LOOPGUARD]] ], [ [[SNEXT_LCSSA]], [[EXIT_LOOPEXIT]] ]
; PTR32-NEXT: ret i8 [[RET]]
;
br label %loopguard
loopguard:
%bi = ptrtoint i8* %buf to i32
%ei = ptrtoint i8* %end to i32
%cnt = sub i32 %ei, %bi
%guard = icmp ult i32 0, %cnt
br i1 %guard, label %preheader, label %exit
preheader:
br label %loop
loop:
%p.01.us.us = phi i8* [ null, %preheader ], [ %gep, %loop ]
%iv = phi i32 [ 0, %preheader ], [ %ivnext, %loop ]
%s = phi i8 [0, %preheader], [%snext, %loop]
%gep = getelementptr inbounds i8, i8* %p.01.us.us, i64 1
%snext = load i8, i8* %gep
%ivnext = add i32 %iv, 1
%cmp = icmp ult i32 %ivnext, %cnt
br i1 %cmp, label %loop, label %exit
exit:
%ret = phi i8 [0, %loopguard], [%snext, %loop]
ret i8 %ret
}
define i8 @testptrint(i8* %buf, i8* %end) nounwind {
; PTR64-LABEL: @testptrint(
; PTR64-NEXT: br label [[LOOPGUARD:%.*]]
; PTR64: loopguard:
; PTR64-NEXT: [[BI:%.*]] = ptrtoint i8* [[BUF:%.*]] to i32
; PTR64-NEXT: [[EI:%.*]] = ptrtoint i8* [[END:%.*]] to i32
; PTR64-NEXT: [[CNT:%.*]] = sub i32 [[EI]], [[BI]]
; PTR64-NEXT: [[GUARD:%.*]] = icmp ult i32 [[BI]], [[CNT]]
; PTR64-NEXT: br i1 [[GUARD]], label [[PREHEADER:%.*]], label [[EXIT:%.*]]
; PTR64: preheader:
; PTR64-NEXT: br label [[LOOP:%.*]]
; PTR64: loop:
; PTR64-NEXT: [[P_01_US_US:%.*]] = phi i8* [ [[BUF]], [[PREHEADER]] ], [ [[GEP:%.*]], [[LOOP]] ]
; PTR64-NEXT: [[IV:%.*]] = phi i32 [ [[BI]], [[PREHEADER]] ], [ [[IVNEXT:%.*]], [[LOOP]] ]
; PTR64-NEXT: [[GEP]] = getelementptr inbounds i8, i8* [[P_01_US_US]], i64 1
; PTR64-NEXT: [[SNEXT:%.*]] = load i8, i8* [[GEP]], align 1
; PTR64-NEXT: [[IVNEXT]] = add nuw i32 [[IV]], 1
; PTR64-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IVNEXT]], [[CNT]]
; PTR64-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
; PTR64: exit.loopexit:
; PTR64-NEXT: [[SNEXT_LCSSA:%.*]] = phi i8 [ [[SNEXT]], [[LOOP]] ]
; PTR64-NEXT: br label [[EXIT]]
; PTR64: exit:
; PTR64-NEXT: [[RET:%.*]] = phi i8 [ 0, [[LOOPGUARD]] ], [ [[SNEXT_LCSSA]], [[EXIT_LOOPEXIT]] ]
; PTR64-NEXT: ret i8 [[RET]]
;
; PTR32-LABEL: @testptrint(
; PTR32-NEXT: br label [[LOOPGUARD:%.*]]
; PTR32: loopguard:
; PTR32-NEXT: [[BI:%.*]] = ptrtoint i8* [[BUF:%.*]] to i32
; PTR32-NEXT: [[EI:%.*]] = ptrtoint i8* [[END:%.*]] to i32
; PTR32-NEXT: [[CNT:%.*]] = sub i32 [[EI]], [[BI]]
; PTR32-NEXT: [[GUARD:%.*]] = icmp ult i32 [[BI]], [[CNT]]
; PTR32-NEXT: br i1 [[GUARD]], label [[PREHEADER:%.*]], label [[EXIT:%.*]]
; PTR32: preheader:
; PTR32-NEXT: br label [[LOOP:%.*]]
; PTR32: loop:
; PTR32-NEXT: [[P_01_US_US:%.*]] = phi i8* [ [[BUF]], [[PREHEADER]] ], [ [[GEP:%.*]], [[LOOP]] ]
; PTR32-NEXT: [[IV:%.*]] = phi i32 [ [[BI]], [[PREHEADER]] ], [ [[IVNEXT:%.*]], [[LOOP]] ]
; PTR32-NEXT: [[GEP]] = getelementptr inbounds i8, i8* [[P_01_US_US]], i64 1
; PTR32-NEXT: [[SNEXT:%.*]] = load i8, i8* [[GEP]], align 1
; PTR32-NEXT: [[IVNEXT]] = add nuw i32 [[IV]], 1
; PTR32-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IVNEXT]], [[CNT]]
; PTR32-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
; PTR32: exit.loopexit:
; PTR32-NEXT: [[SNEXT_LCSSA:%.*]] = phi i8 [ [[SNEXT]], [[LOOP]] ]
; PTR32-NEXT: br label [[EXIT]]
; PTR32: exit:
; PTR32-NEXT: [[RET:%.*]] = phi i8 [ 0, [[LOOPGUARD]] ], [ [[SNEXT_LCSSA]], [[EXIT_LOOPEXIT]] ]
; PTR32-NEXT: ret i8 [[RET]]
;
br label %loopguard
loopguard:
%bi = ptrtoint i8* %buf to i32
%ei = ptrtoint i8* %end to i32
%cnt = sub i32 %ei, %bi
%guard = icmp ult i32 %bi, %cnt
br i1 %guard, label %preheader, label %exit
preheader:
br label %loop
loop:
%p.01.us.us = phi i8* [ %buf, %preheader ], [ %gep, %loop ]
%iv = phi i32 [ %bi, %preheader ], [ %ivnext, %loop ]
%s = phi i8 [0, %preheader], [%snext, %loop]
%gep = getelementptr inbounds i8, i8* %p.01.us.us, i64 1
%snext = load i8, i8* %gep
%ivnext = add i32 %iv, 1
%cmp = icmp ult i32 %ivnext, %cnt
br i1 %cmp, label %loop, label %exit
exit:
%ret = phi i8 [0, %loopguard], [%snext, %loop]
ret i8 %ret
}
; IV and BECount have two different pointer types here.
define void @testnullptr([512 x i8]* %base) nounwind {
; PTR64-LABEL: @testnullptr(
; PTR64-NEXT: entry:
; PTR64-NEXT: [[ADD_PTR1603:%.*]] = getelementptr [512 x i8], [512 x i8]* [[BASE:%.*]], i64 0, i64 512
; PTR64-NEXT: br label [[PREHEADER:%.*]]
; PTR64: preheader:
; PTR64-NEXT: [[CMP1604192:%.*]] = icmp ult i8* undef, [[ADD_PTR1603]]
; PTR64-NEXT: br i1 [[CMP1604192]], label [[FOR_BODY_PREHEADER:%.*]], label [[FOR_END1609:%.*]]
; PTR64: for.body.preheader:
; PTR64-NEXT: br label [[FOR_BODY:%.*]]
; PTR64: for.body:
; PTR64-NEXT: br i1 false, label [[FOR_BODY]], label [[FOR_END1609_LOOPEXIT:%.*]]
; PTR64: for.end1609.loopexit:
; PTR64-NEXT: br label [[FOR_END1609]]
; PTR64: for.end1609:
; PTR64-NEXT: unreachable
;
; PTR32-LABEL: @testnullptr(
; PTR32-NEXT: entry:
; PTR32-NEXT: [[ADD_PTR1603:%.*]] = getelementptr [512 x i8], [512 x i8]* [[BASE:%.*]], i64 0, i64 512
; PTR32-NEXT: br label [[PREHEADER:%.*]]
; PTR32: preheader:
; PTR32-NEXT: [[CMP1604192:%.*]] = icmp ult i8* undef, [[ADD_PTR1603]]
; PTR32-NEXT: br i1 [[CMP1604192]], label [[FOR_BODY_PREHEADER:%.*]], label [[FOR_END1609:%.*]]
; PTR32: for.body.preheader:
; PTR32-NEXT: br label [[FOR_BODY:%.*]]
; PTR32: for.body:
; PTR32-NEXT: br i1 false, label [[FOR_BODY]], label [[FOR_END1609_LOOPEXIT:%.*]]
; PTR32: for.end1609.loopexit:
; PTR32-NEXT: br label [[FOR_END1609]]
; PTR32: for.end1609:
; PTR32-NEXT: unreachable
;
entry:
%add.ptr1603 = getelementptr [512 x i8], [512 x i8]* %base, i64 0, i64 512
br label %preheader
preheader:
%cmp1604192 = icmp ult i8* undef, %add.ptr1603
br i1 %cmp1604192, label %for.body, label %for.end1609
for.body:
%r.17193 = phi i8* [ %incdec.ptr1608, %for.body ], [ null, %preheader ]
%incdec.ptr1608 = getelementptr i8, i8* %r.17193, i64 1
%cmp1604 = icmp ult i8* %incdec.ptr1608, %add.ptr1603
br i1 %cmp1604, label %for.body, label %for.end1609
for.end1609:
unreachable
}
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