cdd920b692
Adds examples/1651-platform-asm-x86-syscall-write.sx — the canonical
inline-asm use case: `write(2)` via a raw x86_64 `syscall` (SYS_write
in rax, fd/buf/count pinned to rdi/rsi/rdx, rcx+r11+memory clobbered,
byte count returned in rax). Exercises register-pinned inputs, a pinned
value output, a pointer input (*u8 -> rsi), and clobbers(.…) lowering
together.
x86-pinned via .build { "target": "x86_64-linux" }: ir-only on this
aarch64 host (the .ir snapshot locks the exact constraint string
`={rax},{rax},{rdi},{rsi},{rdx},~{rcx},~{r11},~{memory}` — the §II.11
silent-miscompile risk zone), runs natively on x86_64-linux printing
"ok\n" (hand-authored .stdout, asserted only in execute mode).
Pure additive test coverage — no compiler change (lock commit).
zig build test green (660 corpus, 446 unit).
29 lines
933 B
Plaintext
29 lines
933 B
Plaintext
|
|
; Function Attrs: nounwind
|
|
define internal i64 @sys_write(i64 %0, ptr %1, i64 %2) #0 {
|
|
entry:
|
|
%alloca = alloca i64, align 8
|
|
store i64 %0, ptr %alloca, align 8
|
|
%allocaN = alloca ptr, align 8
|
|
store ptr %1, ptr %allocaN, align 8
|
|
%allocaN = alloca i64, align 8
|
|
store i64 %2, ptr %allocaN, align 8
|
|
%load = load i64, ptr %alloca, align 8
|
|
%loadN = load ptr, ptr %allocaN, align 8
|
|
%loadN = load i64, ptr %allocaN, align 8
|
|
%asm = call i64 asm sideeffect "syscall", "={rax},{rax},{rdi},{rsi},{rdx},~{rcx},~{r11},~{memory}"(i64 1, i64 %load, ptr %loadN, i64 %loadN)
|
|
ret i64 %asm
|
|
}
|
|
|
|
; Function Attrs: nounwind
|
|
define i32 @main() #0 {
|
|
entry:
|
|
%alloca = alloca [3 x i8], align 1
|
|
store [3 x i8] c"ok\0A", ptr %alloca, align 1
|
|
%igp.ptr = getelementptr i8, ptr %alloca, i64 0
|
|
%call = call i64 @sys_write(i64 1, ptr %igp.ptr, i64 3)
|
|
%allocaN = alloca i64, align 8
|
|
store i64 %call, ptr %allocaN, align 8
|
|
ret i32 0
|
|
}
|