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Revert r301487: Replace HashString algorithm with xxHash64

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This reverts commit r301487 to make buildbots green.

llvm-svn: 301491
This commit is contained in:
Rui Ueyama 2017-04-26 23:15:10 +00:00
parent 23c2febb59
commit f21b94f83c
6 changed files with 28 additions and 27 deletions
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15
include/llvm/ADT/StringExtras.h
View File

@ -16,7 +16,6 @@
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/xxhash.h"
#include <iterator>
namespace llvm {
@ -152,11 +151,15 @@ void SplitString(StringRef Source,
/// HashString - Hash function for strings.
///
/// Just fall back on xxHash64. Yes we drop the high bits on platforms where
/// unsigned == 4 bytes (which includes x86_64), but xxHash64 already has good
/// avalanching, so we wouldn't gain much if anything.
static inline unsigned HashString(StringRef Str, unsigned Seed = 0) {
return xxHash64(Str, Seed);
/// This is the Bernstein hash function.
//
// FIXME: Investigate whether a modified bernstein hash function performs
// better: http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx
// X*33+c -> X*33^c
static inline unsigned HashString(StringRef Str, unsigned Result = 0) {
for (StringRef::size_type i = 0, e = Str.size(); i != e; ++i)
Result = Result * 33 + (unsigned char)Str[i];
return Result;
}
/// Returns the English suffix for an ordinal integer (-st, -nd, -rd, -th).

2
include/llvm/Support/xxhash.h
View File

@ -41,7 +41,7 @@
#include "llvm/ADT/StringRef.h"
namespace llvm {
uint64_t xxHash64(llvm::StringRef Data, uint64_t Seed = 0);
uint64_t xxHash64(llvm::StringRef Data);
}
#endif

3
lib/Support/xxhash.cpp
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@ -68,8 +68,9 @@ static uint64_t mergeRound(uint64_t Acc, uint64_t Val) {
return Acc;
}
uint64_t llvm::xxHash64(StringRef Data, uint64_t Seed) {
uint64_t llvm::xxHash64(StringRef Data) {
size_t Len = Data.size();
uint64_t Seed = 0;
const char *P = Data.data();
const char *const BEnd = P + Len;
uint64_t H64;

4
test/DebugInfo/Generic/accel-table-hash-collisions.ll
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@ -27,12 +27,12 @@
; Check that all the names are present in the output
; CHECK: Hash = 0x00597841
; CHECK: Name: {{[0-9a-f]*}} "k1"
; CHECK: Name: {{[0-9a-f]*}} "is"
; CHECK: Name: {{[0-9a-f]*}} "k1"
; CHECK: Hash = 0xa4b42a1e
; CHECK: Name: {{[0-9a-f]*}} "_ZN4llvm16DenseMapIteratorIPNS_10MDLocationENS_6detail13DenseSetEmptyENS_10MDNodeInfoIS1_EENS3_12DenseSetPairIS2_EELb0EE23AdvancePastEmptyBucketsEv"
; CHECK: Name: {{[0-9a-f]*}} "_ZN5clang23DataRecursiveASTVisitorIN12_GLOBAL__N_124UnusedBackingIvarCheckerEE26TraverseCUDAKernelCallExprEPNS_18CUDAKernelCallExprE"
; CHECK: Name: {{[0-9a-f]*}} "_ZN4llvm16DenseMapIteratorIPNS_10MDLocationENS_6detail13DenseSetEmptyENS_10MDNodeInfoIS1_EENS3_12DenseSetPairIS2_EELb0EE23AdvancePastEmptyBucketsEv"
; CHECK: Hash = 0xeee7c0b2
; CHECK: Name: {{[0-9a-f]*}} "_ZNK4llvm12LivePhysRegs5printERNS_11raw_ostreamE"

4
test/DebugInfo/PDB/pdbdump-headers.test
View File

@ -73,8 +73,8 @@
; EMPTY-NEXT: Guid: {0B355641-86A0-A249-896F-9988FAE52FF0}
; EMPTY-NEXT: Features: 0x1
; EMPTY-NEXT: Named Streams {
; EMPTY-NEXT: /LinkInfo: 5
; EMPTY-NEXT: /names: 13
; EMPTY-NEXT: /LinkInfo: 5
; EMPTY-NEXT: /src/headerblock: 9
; EMPTY-NEXT: }
; EMPTY-NEXT: }
@ -1837,8 +1837,8 @@
; BIG-NEXT: Guid: {880ECC89-DF81-0B4F-839C-58CBD052E937}
; BIG-NEXT: Features: 0x1
; BIG-NEXT: Named Streams {
; BIG-NEXT: /LinkInfo: 5
; BIG-NEXT: /names: 13
; BIG-NEXT: /LinkInfo: 5
; BIG-NEXT: /src/headerblock: 61
; BIG-NEXT: }
; BIG-NEXT: }

27
test/DebugInfo/X86/gnu-public-names.ll
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@ -66,7 +66,6 @@
; ASM: .section .debug_gnu_pubnames
; ASM: .byte 32 # Kind: VARIABLE, EXTERNAL
; ASM: .byte 32 # Kind: VARIABLE, EXTERNAL
; ASM-NEXT: .asciz "global_variable" # External Name
; ASM: .section .debug_gnu_pubtypes
@ -198,29 +197,27 @@
; CHECK-LABEL: .debug_gnu_pubnames contents:
; CHECK-NEXT: length = {{.*}} version = 0x0002 unit_offset = 0x00000000 unit_size = {{.*}}
; CHECK-NEXT: Offset Linkage Kind Name
; CHECK-NEXT: [[ANON_INNER_B]] STATIC VARIABLE "(anonymous namespace)::inner::b"
; CHECK-NEXT: [[MEM_FUNC]] EXTERNAL FUNCTION "C::member_function"
; CHECK-NEXT: [[OUTER]] EXTERNAL TYPE "outer"
; CHECK-NEXT: [[GLOB_NS_VAR]] EXTERNAL VARIABLE "ns::global_namespace_variable"
; CHECK-NEXT: [[GLOB_VAR]] EXTERNAL VARIABLE "global_variable"
; CHECK-NEXT: EXTERNAL FUNCTION "f7"
; CHECK-NEXT: [[OUTER_ANON]] EXTERNAL TYPE "outer::(anonymous namespace)"
; CHECK-NEXT: [[GLOBAL_FUNC]] EXTERNAL FUNCTION "global_function"
; CHECK-NEXT: [[GLOB_NS_FUNC]] EXTERNAL FUNCTION "ns::global_namespace_function"
; CHECK-NEXT: [[NS]] EXTERNAL TYPE "ns"
; CHECK-NEXT: [[ANON]] EXTERNAL TYPE "(anonymous namespace)"
; CHECK-NEXT: [[OUTER_ANON_C]] STATIC VARIABLE "outer::(anonymous namespace)::c"
; CHECK-NEXT: [[D_VAR]] EXTERNAL VARIABLE "ns::d"
; CHECK-NEXT: [[STATIC_MEM_FUNC]] EXTERNAL FUNCTION "C::static_member_function"
; CHECK-NEXT: [[STATIC_MEM_VAR]] EXTERNAL VARIABLE "C::static_member_variable"
; CHECK-NEXT: [[ANON_I]] STATIC VARIABLE "(anonymous namespace)::i"
; CHECK-NEXT: [[ANON_INNER]] EXTERNAL TYPE "(anonymous namespace)::inner"
; CHECK-NEXT: EXTERNAL FUNCTION "f3"
; GCC Doesn't put local statics in pubnames, but it seems not unreasonable and
; comes out naturally from LLVM's implementation, so I'm OK with it for now. If
; it's demonstrated that this is a major size concern or degrades debug info
; consumer behavior, feel free to change it.
; CHECK-NEXT: [[F3_Z]] STATIC VARIABLE "f3::z"
; CHECK-NEXT: [[ANON]] EXTERNAL TYPE "(anonymous namespace)"
; CHECK-NEXT: [[OUTER_ANON]] EXTERNAL TYPE "outer::(anonymous namespace)"
; CHECK-NEXT: [[ANON_INNER_B]] STATIC VARIABLE "(anonymous namespace)::inner::b"
; CHECK-NEXT: [[OUTER]] EXTERNAL TYPE "outer"
; CHECK-NEXT: [[MEM_FUNC]] EXTERNAL FUNCTION "C::member_function"
; CHECK-NEXT: [[GLOB_VAR]] EXTERNAL VARIABLE "global_variable"
; CHECK-NEXT: [[GLOB_NS_VAR]] EXTERNAL VARIABLE "ns::global_namespace_variable"
; CHECK-NEXT: [[ANON_INNER]] EXTERNAL TYPE "(anonymous namespace)::inner"
; CHECK-NEXT: [[D_VAR]] EXTERNAL VARIABLE "ns::d"
; CHECK-NEXT: [[GLOB_NS_FUNC]] EXTERNAL FUNCTION "ns::global_namespace_function"
; CHECK-NEXT: [[STATIC_MEM_VAR]] EXTERNAL VARIABLE "C::static_member_variable"
; CHECK-NEXT: [[STATIC_MEM_FUNC]] EXTERNAL FUNCTION "C::static_member_function"
; CHECK-LABEL: debug_gnu_pubtypes contents:
; CHECK: Offset Linkage Kind Name