luismarques

	.text
	.file	"excpt.d"
	.section	.text.allocException,"axG",@progbits,allocException,comdat
	.globl	allocException
	.p2align	2
	.type	allocException,@function
allocException:
	.cfi_startproc
	addi	sp, sp, -16
	sw	ra, 12(sp)

luismarques

module common;

class A {}
class B : A {}
class C : B {}

// ---

module one;

luismarques

import std.algorithm;
import std.math;
import std.random;
import std.range : array, iota, take;
import std.stdio;
import mir.ndslice.sorting;
import mir.random.algorithm;
import mir.random.engine.pcg;
import mir.random.engine.splitmix;
import mir.random.variable;

luismarques

embench/build-ibex-gcc/src/aha-mont64/aha-mont64:     file format elf32-littleriscv


Disassembly of section .vectors:

00100000 <_stack_start-0x100000>:
	...
  100080:	0040006f          	j	100084 <_start>

luismarques

embench/build-ibex-gcc/src/aha-mont64/aha-mont64:     file format elf32-littleriscv


Disassembly of section .vectors:

00100000 <_stack_start-0x100000>:
	...
  100080:	0040006f          	j	100084 <_start>

luismarques

embench/build-ibex-clang/src/aha-mont64/aha-mont64:     file format elf32-littleriscv


Disassembly of section .vectors:

00100000 <_stack_start-0x100000>:
	...
  100080:	0040006f          	j	100084 <_start>

luismarques

embench/build-ibex-clang/src/aha-mont64/aha-mont64:     file format elf32-littleriscv


Disassembly of section .vectors:

00100000 <_stack_start-0x100000>:
	...
  100080:	0040006f          	j	100084 <_start>

luismarques

cmake ../llvm   -G Ninja   -DCMAKE_BUILD_TYPE="Release"   -DBUILD_SHARED_LIBS=True   -DLLVM_USE_SPLIT_DWARF=True   -DLLVM_BUILD_TESTS=True   -DLLVM_TARGETS_TO_BUILD="host;RISCV"   -DLLVM_APPEND_VC_REV=False   -DLLVM_ENABLE_PROJECTS="clang"
(...)

[1522/3721] Linking CXX shared library lib/libLLVMObject.so.11git
FAILED: lib/libLLVMObject.so.11git 
: && /usr/bin/c++ -fPIC -fPIC -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wno-comment -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG  -Wl,-z,defs -Wl,-z,nodelete   -Wl,-rpath-link,/home/luismarques/llvm-rv32/build/./lib  -Wl,-O3 -Wl,--gc-sections -shared -Wl,-soname,libLLVMObject.so.11git -o lib/libLLVMObject.so.11git lib/Object/CMakeFiles/LLVMObject.dir/Archive.cpp.o lib/Object/CMakeFiles/LL

luismarques

Examples of poor code generation

• Constant materialization
• Sign extensions
• Comparisons
• Math optimisations
• Inefficient float loads
• FP comparison branchiness
• FP constant materialisation
• Unnecessary and after feq.d

luismarques

[scenario]
filename = case-8cZhmPry.c
arch = rv32gc
abi = ilp32d
cost1 = 36
cost2 = 49

### Source:
short a;
double b;