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remove condition codes

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LLVM always assumes these are on. Zig backends do not observe them.

If Zig backends want to start using them, they can be introduced, one
arch at a time, with proper documentation.
This commit is contained in:
Andrew Kelley 2025-07-15 16:09:47 -07:00
parent de9c0e4580
commit 15f45e89a7
4 changed files with 19 additions and 18 deletions
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1
lib/std/builtin/assembly.zig
View File

@ -4,6 +4,7 @@ pub const Clobbers = switch (@import("builtin").cpu.arch) {
/// addresses other than those derived from input pointer provenance.
memory: bool = false,
/// Condition codes. Subset of the bits in `eflags` and `rflags`.
cc: bool = false,
dirflag: bool = false,
eflags: bool = false,

18
lib/std/os/linux/aarch64.zig
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@ -18,7 +18,7 @@ pub fn syscall0(number: SYS) usize {
return asm volatile ("svc #0"
: [ret] "={x0}" (-> usize),
: [number] "{x8}" (@intFromEnum(number)),
: .{ .memory = true, .cc = true });
: .{ .memory = true });
}
pub fn syscall1(number: SYS, arg1: usize) usize {
@ -26,7 +26,7 @@ pub fn syscall1(number: SYS, arg1: usize) usize {
: [ret] "={x0}" (-> usize),
: [number] "{x8}" (@intFromEnum(number)),
[arg1] "{x0}" (arg1),
: .{ .memory = true, .cc = true });
: .{ .memory = true });
}
pub fn syscall2(number: SYS, arg1: usize, arg2: usize) usize {
@ -35,7 +35,7 @@ pub fn syscall2(number: SYS, arg1: usize, arg2: usize) usize {
: [number] "{x8}" (@intFromEnum(number)),
[arg1] "{x0}" (arg1),
[arg2] "{x1}" (arg2),
: .{ .memory = true, .cc = true });
: .{ .memory = true });
}
pub fn syscall3(number: SYS, arg1: usize, arg2: usize, arg3: usize) usize {
@ -45,7 +45,7 @@ pub fn syscall3(number: SYS, arg1: usize, arg2: usize, arg3: usize) usize {
[arg1] "{x0}" (arg1),
[arg2] "{x1}" (arg2),
[arg3] "{x2}" (arg3),
: .{ .memory = true, .cc = true });
: .{ .memory = true });
}
pub fn syscall4(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize) usize {
@ -56,7 +56,7 @@ pub fn syscall4(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize)
[arg2] "{x1}" (arg2),
[arg3] "{x2}" (arg3),
[arg4] "{x3}" (arg4),
: .{ .memory = true, .cc = true });
: .{ .memory = true });
}
pub fn syscall5(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
@ -68,7 +68,7 @@ pub fn syscall5(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize,
[arg3] "{x2}" (arg3),
[arg4] "{x3}" (arg4),
[arg5] "{x4}" (arg5),
: .{ .memory = true, .cc = true });
: .{ .memory = true });
}
pub fn syscall6(
@ -89,7 +89,7 @@ pub fn syscall6(
[arg4] "{x3}" (arg4),
[arg5] "{x4}" (arg5),
[arg6] "{x5}" (arg6),
: .{ .memory = true, .cc = true });
: .{ .memory = true });
}
pub fn clone() callconv(.naked) usize {
@ -141,12 +141,12 @@ pub fn restore_rt() callconv(.naked) noreturn {
\\ svc #0
:
: [number] "i" (@intFromEnum(SYS.rt_sigreturn)),
: .{ .memory = true, .cc = true }),
: .{ .memory = true }),
else => asm volatile (
\\ svc #0
:
: [number] "{x8}" (@intFromEnum(SYS.rt_sigreturn)),
: .{ .memory = true, .cc = true }),
: .{ .memory = true }),
}
}

2
lib/std/start.zig
View File

@ -145,7 +145,7 @@ fn exit2(code: usize) noreturn {
:
: [number] "{x8}" (93),
[arg1] "{x0}" (code),
: .{ .memory = true, .cc = true });
: .{ .memory = true });
},
.sparc64 => {
asm volatile ("ta 0x6d"

16
lib/std/valgrind.zig
View File

@ -17,7 +17,7 @@ pub fn doClientRequest(default: usize, request: usize, a1: usize, a2: usize, a3:
: [_] "={r3}" (-> usize),
: [_] "{r4}" (args),
[_] "{r3}" (default),
: .{ .cc = true, .memory = true }),
: .{ .memory = true }),
.aarch64, .aarch64_be => asm volatile (
\\ ror x12, x12, #3 ; ror x12, x12, #13
\\ ror x12, x12, #51 ; ror x12, x12, #61
@ -25,7 +25,7 @@ pub fn doClientRequest(default: usize, request: usize, a1: usize, a2: usize, a3:
: [_] "={x3}" (-> usize),
: [_] "{x4}" (args),
[_] "{x3}" (default),
: .{ .cc = true, .memory = true }),
: .{ .memory = true }),
.mips, .mipsel => asm volatile (
\\ srl $0, $0, 13
\\ srl $0, $0, 29
@ -51,7 +51,7 @@ pub fn doClientRequest(default: usize, request: usize, a1: usize, a2: usize, a3:
: [_] "={r3}" (-> usize),
: [_] "{r4}" (args),
[_] "{r3}" (default),
: .{ .cc = true, .memory = true }),
: .{ .memory = true }),
.powerpc64, .powerpc64le => asm volatile (
\\ rotldi 0, 0, 3 ; rotldi 0, 0, 13
\\ rotldi 0, 0, 61 ; rotldi 0, 0, 51
@ -59,7 +59,7 @@ pub fn doClientRequest(default: usize, request: usize, a1: usize, a2: usize, a3:
: [_] "={r3}" (-> usize),
: [_] "{r4}" (args),
[_] "{r3}" (default),
: .{ .cc = true, .memory = true }),
: .{ .memory = true }),
.riscv64 => asm volatile (
\\ .option push
\\ .option norvc
@ -72,7 +72,7 @@ pub fn doClientRequest(default: usize, request: usize, a1: usize, a2: usize, a3:
: [_] "={a3}" (-> usize),
: [_] "{a4}" (args),
[_] "{a3}" (default),
: .{ .cc = true, .memory = true }),
: .{ .memory = true }),
.s390x => asm volatile (
\\ lr %%r15, %%r15
\\ lr %%r1, %%r1
@ -82,7 +82,7 @@ pub fn doClientRequest(default: usize, request: usize, a1: usize, a2: usize, a3:
: [_] "={r3}" (-> usize),
: [_] "{r2}" (args),
[_] "{r3}" (default),
: .{ .cc = true, .memory = true }),
: .{ .memory = true }),
.x86 => asm volatile (
\\ roll $3, %%edi ; roll $13, %%edi
\\ roll $29, %%edi ; roll $19, %%edi
@ -90,7 +90,7 @@ pub fn doClientRequest(default: usize, request: usize, a1: usize, a2: usize, a3:
: [_] "={edx}" (-> usize),
: [_] "{eax}" (args),
[_] "{edx}" (default),
: .{ .cc = true, .memory = true }),
: .{ .memory = true }),
.x86_64 => asm volatile (
\\ rolq $3, %%rdi ; rolq $13, %%rdi
\\ rolq $61, %%rdi ; rolq $51, %%rdi
@ -98,7 +98,7 @@ pub fn doClientRequest(default: usize, request: usize, a1: usize, a2: usize, a3:
: [_] "={rdx}" (-> usize),
: [_] "{rax}" (args),
[_] "{rdx}" (default),
: .{ .cc = true, .memory = true }),
: .{ .memory = true }),
else => default,
};
}