GNU as assembler (binutils-2.25) type sizes for x86 and x86_64

0_TL_DR.markdown

TL;DR

Integer types

• .octa 16 bytes on x86_64 and x86
• .quad 8 bytes on x86_64 and x86
• .long and .int 4 bytes on x86_64 and x86
• .word, .short and .hword 2 bytes on x86_64 and x86
• .byte is, of course, 1 byte on x86_64 and x86

Floating-point types

• .tfloat 10 bytes on x86_64 and x86
• .double 8 bytes on x86_64 and x86
• .single and .float 4 bytes on x86_64 and x86

Official Docs - Pseudo Ops

Makefile

.PHONY: info build clean build

DUMMY_FILES = byte.32 byte.64 short.32 short.64 hword.32 hword.64 int.32 int.64 word.32 word.64 long.32 long.64 quad.32 quad.64 octa.32 octa.64 double.32 double.64 single.32 single.64 float.32 float.64 tfloat.32 tfloat.64

DUMMY_BINARIES = byte.32.bin byte.64.bin short.32.bin short.64.bin hword.32.bin hword.64.bin int.32.bin int.64.bin word.32.bin word.64.bin long.32.bin long.64.bin quad.32.bin quad.64.bin octa.32.bin octa.64.bin double.32.bin double.64.bin single.32.bin single.64.bin float.32.bin float.64.bin tfloat.32.bin tfloat.64.bin

info: build
	nm -S $(DUMMY_BINARIES)

build: $(DUMMY_BINARIES)

%.64:
	sed "s/{{TYPE}}/$$(echo $@ | sed 's/\.64//')/g" < template.64 > $@
	
%.32:
	sed "s/{{TYPE}}/$$(echo $@ | sed 's/\.32//')/g" < template.32 > $@

%.64.bin: %.64
	$(AS) --64 -o $@ $^

%.32.bin: %.32
	$(AS) --32 -o $@ $^

rebuild: clean build

clean:
	rm -f $(DUMMY_FILES) $(DUMMY_BINARIES)

results.txt

byte.32.bin:
00000000 00000001 t byte32

byte.64.bin:
0000000000000000 0000000000000001 t byte64

short.32.bin:
00000000 00000002 t short32

short.64.bin:
0000000000000000 0000000000000002 t short64

hword.32.bin:
00000000 00000002 t hword32

hword.64.bin:
0000000000000000 0000000000000002 t hword64

int.32.bin:
00000000 00000004 t int32

int.64.bin:
0000000000000000 0000000000000004 t int64

word.32.bin:
00000000 00000002 t word32

word.64.bin:
0000000000000000 0000000000000002 t word64

long.32.bin:
00000000 00000004 t long32

long.64.bin:
0000000000000000 0000000000000004 t long64

quad.32.bin:
00000000 00000008 t quad32

quad.64.bin:
0000000000000000 0000000000000008 t quad64

octa.32.bin:
00000000 00000010 t octa32

octa.64.bin:
0000000000000000 0000000000000010 t octa64

double.32.bin:
00000000 00000008 t double32

double.64.bin:
0000000000000000 0000000000000008 t double64

single.32.bin:
00000000 00000004 t single32

single.64.bin:
0000000000000000 0000000000000004 t single64

float.32.bin:
00000000 00000004 t float32

float.64.bin:
0000000000000000 0000000000000004 t float64

tfloat.32.bin:
00000000 0000000a t tfloat32

tfloat.64.bin:
0000000000000000 000000000000000a t tfloat64

template.32

.code32
{{TYPE}}32: .{{TYPE}} 0
.size {{TYPE}}32, . - {{TYPE}}32

template.64

.code64
{{TYPE}}64: .{{TYPE}} 0
.size {{TYPE}}64, . - {{TYPE}}64