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) {

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

> 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

; 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

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• I am chandlerc on github.
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To claim this, I am signing this object:

chandlerc

/* bench.h - benchmark harness

   Written in 2014 by Austin Seipp <aseipp@pobox.com>

   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

#!/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

#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

#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

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)