chandlerc

Partitioning of alloca:   %a = alloca [2000 x i8]
  partition #0 [0,42) (splittable)
    used by:   call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %b, i32 2000, i32 1, i1 false)
    used by:   call void @llvm.memcpy.p0i8.p0i8.i32(i8* %b, i8* %src, i32 2000, i32 1, i1 false)
  partition #1 [42,43)
    used by:   store i8 0, i8* %c
    used by:   call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %b, i32 2000, i32 1, i1 false)
    used by:   call void @llvm.memcpy.p0i8.p0i8.i32(i8* %b, i8* %src, i32 2000, i32 1, i1 false)
  partition #2 [43,142) (splittable)
    used by:   call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %b, i32 2000, i32 1, i1 false)

chandlerc

#define FOO BAZ
#define FOOBAR 1
#define BAZBAR 0
#define M(x) x ## BAR
#if M(FOO)
#error not pre-expanded
#else
#error pre-expanded
#endif

chandlerc

#define noinline foobar
#define __clang_internal_attribute_test_macro__noinline 1
#define __clang_internal_attribute_test_macro__foobar 0
#define __my_has_attribute(x) __clang_internal_attribute_test_macro__ ## x
#if __my_has_attribute(noinline)
#error found the feature test macro
#else
#error found something else
#endif

chandlerc

#!/bin/bash

SIZE=$(($RANDOM % 400))
SEED=$RANDOM
CMD="./bin/llc -o /dev/null $ARGS"

set pipefail
if ! ./bin/llvm-stress -size=$SIZE -seed=$SEED | $CMD; then
  ./bin/llvm-stress -size=$SIZE -seed=$SEED > /tmp/stress_crash_${SIZE}_${SEED}.ll
  echo "CRASH: $CMD /tmp/stress_crash_${SIZE}_${SEED}.ll"

chandlerc

/* bench.h - benchmark harness

   Written in 2014 by Austin Seipp <[email protected]>

   To the extent possible under law, the author(s) have dedicated all
   copyright and related and neighboring rights to this software to
   the public domain worldwide. This software is distributed without
   any warranty.

   You should have received a copy of the CC0 Public Domain Dedication

chandlerc

Keybase proof

I hereby claim:

• I am chandlerc on github.
• I am chandlerc (https://keybase.io/chandlerc) on keybase.
• I have a public key ASDFO1yHMQupYTVLfF8svO5CT8Cq1XCYX24GMo9dowLgJAo

To claim this, I am signing this object:

chandlerc

; ModuleID = '<stdin>'
source_filename = "/tmp/RISCVAttributeParser-87fe8d.cpp"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%"struct.llvm::RISCVAttributeParser::DisplayHandler" = type { i32, { i64, i64 } }
%"struct.std::__1::__libcpp_debug_info" = type { i8*, i32, i8*, i8* }
%"class.llvm::Error" = type { %"class.llvm::ErrorInfoBase"* }
%"class.llvm::ErrorInfoBase" = type { i32 (...)** }
%"class.llvm::ELFAttributeParser" = type { i32 (...)**, %"class.llvm::StringRef", %"class.std::__1::unordered_map", %"class.std::__1::unordered_map.15", %"class.llvm::ScopedPrinter"*, %"class.llvm::ArrayRef", %"class.llvm::DataExtractor", %"class.llvm::DataExtractor::Cursor" }

chandlerc

> llc -fast-isel -function-sections -data-sections --relocation-model=pic reduced.test.ll -o - | tee /dev/stderr | clang -fpie -fdata-sections -ffunction-sections -O1 -o reduced.test -x assembler -; and otool -t -v reduced.test
reduced.test:
(__TEXT,__text) section
_my_function:
0000000100003e88        stp     x29, x30, [sp, #-0x10]!
0000000100003e8c        adrp    x8, 517 ; 0x100208000
0000000100003e90        add     x9, x8, #0xe0
0000000100003e94        str     x0, [x9]
0000000100003e98        tbnz    w1, #0x0, 0x100003ea8
0000000100003e9c        ldr     x0, [x8, #0xe0]

chandlerc

target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "arm64-apple-macosx12.0.0"

@_ZN4absl14flags_internal12_GLOBAL__N_115specified_flagsE = external dso_local global { ptr, [24 x i8] }

declare ptr @_ZN4absl9MutexLockD1Ev(ptr)

define void @_ZN4absl14flags_internal20ParseCommandLineImplEiPPcNS0_14ArgvListActionENS0_16UsageFlagsActionENS0_15OnUndefinedFlagE(ptr %0, ptr %1, i1 %2, i64 %3, i8 %4, i8 %5, i64 %6, i1 %7, i1 %8, i1 %9, i64 %10, ptr %11, ptr %12, ptr %13, i1 %14, i1 %15) personality ptr null {
  %17 = load i64, ptr null, align 8
  br label %18

chandlerc

; ModuleID = 'reduced.test.ll'
source_filename = "reduced.test.ll"
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "arm64-apple-macosx12.0.0"

@global = global { [2 x [1024 x [1024 x i8]]], [7 x [32 x i8]] } zeroinitializer
@global.1 = dso_local global { ptr, [24 x i8] } zeroinitializer
@global.2 = global { [2 x [1024 x [1024 x i8]]], [13 x [32 x i8]] } zeroinitializer

define ptr @wobble(ptr %arg) {