mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-19 11:02:59 +02:00
adddf2a5ad
This reverts commit 11dccf8d3aa5d55210f8b886fb21926c7a8353ca. A bootstrapped clang crashes (due to ArrayRef::front called on an empty ArrayRef) when compiling some files. Very strangely, this only reproduces with modules. ``` 13 0x0000564d3349e968 llvm::ArrayRef<llvm::BasicBlock*>::front() const /proc/self/cwd/llvm/include/llvm/ADT/ArrayRef.h:160:7 14 0x0000564d3349e896 llvm::LoopBase<llvm::BasicBlock, llvm::Loop>::getHeader() const /proc/self/cwd/llvm/include/llvm/Analysis/LoopInfo.h:104:50 15 0x0000564d3349fd9d llvm::LoopBase<llvm::BasicBlock, llvm::Loop>::getLoopLatch() const /proc/self/cwd/llvm/include/llvm/Analysis/LoopInfoImpl.h:210:11 16 0x0000564d33593c8a llvm::ScalarEvolution::computeBackedgeTakenCount(llvm::Loop const*, bool) /proc/self/cwd/llvm/lib/Analysis/ScalarEvolution.cpp:6933:15 17 0x0000564d33592ebc llvm::ScalarEvolution::getBackedgeTakenInfo(llvm::Loop const*) /proc/self/cwd/llvm/lib/Analysis/ScalarEvolution.cpp:0:30 18 0x0000564d33593a54 llvm::ScalarEvolution::getBackedgeTakenCount(llvm::Loop const*, llvm::ScalarEvolution::ExitCountKind) /proc/self/cwd/llvm/lib/Analysis/ScalarEvolution.cpp:6487:36 19 0x0000564d32be2402 llvm::ScalarEvolution::getConstantMaxBackedgeTakenCount(llvm::Loop const*) /proc/self/cwd/llvm/include/llvm/Analysis/ScalarEvolution.h:768:5 20 0x0000564d33590807 llvm::ScalarEvolution::getRangeRef(llvm::SCEV const*, llvm::ScalarEvolution::RangeSignHint) /proc/self/cwd/llvm/lib/Analysis/ScalarEvolution.cpp:5495:19 21 0x0000564d320abab7 llvm::ScalarEvolution::getSignedRange(llvm::SCEV const*) /proc/self/cwd/llvm/include/llvm/Analysis/ScalarEvolution.h:840:12 22 0x0000564d335a03aa llvm::ScalarEvolution::isKnownPredicateViaConstantRanges(llvm::CmpInst::Predicate, llvm::SCEV const*, llvm::SCEV const*) /proc/self/cwd/llvm/lib/Analysis/ScalarEvolution.cpp:9239:60 23 0x0000564d33586a80 llvm::ScalarEvolution::isKnownViaNonRecursiveReasoning(llvm::CmpInst::Predicate, llvm::SCEV const*, llvm::SCEV const*) /proc/self/cwd/llvm/lib/Analysis/ScalarEvolution.cpp:10284:60 ```
53 lines
2.1 KiB
LLVM
53 lines
2.1 KiB
LLVM
; RUN: opt -analyze -enable-new-pm=0 -scalar-evolution -S < %s | FileCheck %s
|
|
; RUN: opt -disable-output "-passes=print<scalar-evolution>" -S < %s 2>&1 | FileCheck %s
|
|
|
|
; The exit value from this loop was originally calculated as 0.
|
|
; The actual exit condition is 256*256 == 0 (in i16).
|
|
|
|
; CHECK: Printing analysis 'Scalar Evolution Analysis' for function 'f0':
|
|
; CHECK-NEXT: Classifying expressions for: @f0
|
|
; CHECK-NEXT: %v1 = phi i16 [ 0, %b0 ], [ %v2, %b1 ]
|
|
; CHECK-NEXT: --> {0,+,-1}<%b1> U: [-255,1) S: [-255,1) Exits: -255 LoopDispositions: { %b1: Computable }
|
|
; CHECK-NEXT: %v2 = add i16 %v1, -1
|
|
; CHECK-NEXT: --> {-1,+,-1}<%b1> U: [-256,0) S: [-256,0) Exits: -256 LoopDispositions: { %b1: Computable }
|
|
; CHECK-NEXT: %v3 = mul i16 %v2, %v2
|
|
; CHECK-NEXT: --> {1,+,3,+,2}<%b1> U: full-set S: full-set Exits: 0 LoopDispositions: { %b1: Computable }
|
|
; CHECK-NEXT: %v5 = phi i16 [ %v2, %b1 ]
|
|
; CHECK-NEXT: --> %v5 U: [-256,0) S: [-256,0)
|
|
; CHECK-NEXT: %v6 = phi i16 [ %v3, %b1 ]
|
|
; CHECK-NEXT: --> %v6 U: full-set S: full-set
|
|
; CHECK-NEXT: %v7 = sext i16 %v5 to i32
|
|
; CHECK-NEXT: --> (sext i16 %v5 to i32) U: [-256,0) S: [-256,0)
|
|
; CHECK-NEXT: Determining loop execution counts for: @f0
|
|
; CHECK-NEXT: Loop %b1: backedge-taken count is 255
|
|
; CHECK-NEXT: Loop %b1: max backedge-taken count is 255
|
|
; CHECK-NEXT: Loop %b1: Predicated backedge-taken count is 255
|
|
; CHECK-NEXT: Predicates:
|
|
; CHECK-EMPTY:
|
|
; CHECK-NEXT: Loop %b1: Trip multiple is 256
|
|
|
|
|
|
@g0 = global i32 0, align 4
|
|
@g1 = global i16 0, align 2
|
|
|
|
define signext i32 @f0() {
|
|
b0:
|
|
br label %b1
|
|
|
|
b1: ; preds = %b1, %b0
|
|
%v1 = phi i16 [ 0, %b0 ], [ %v2, %b1 ]
|
|
%v2 = add i16 %v1, -1
|
|
%v3 = mul i16 %v2, %v2
|
|
%v4 = icmp eq i16 %v3, 0
|
|
br i1 %v4, label %b2, label %b1
|
|
|
|
b2: ; preds = %b1
|
|
%v5 = phi i16 [ %v2, %b1 ]
|
|
%v6 = phi i16 [ %v3, %b1 ]
|
|
%v7 = sext i16 %v5 to i32
|
|
store i32 %v7, i32* @g0, align 4
|
|
store i16 %v6, i16* @g1, align 2
|
|
ret i32 0
|
|
}
|
|
|