Source
pub fn cTypePreferredAlignment(target: Target, c_type: CType) u16 {
// Overrides for unusual alignments
switch (target.cpu.arch) {
.arc => switch (c_type) {
.longdouble => return 4,
else => {},
},
.avr => return 1,
.x86 => switch (target.os.tag) {
.elfiamcu => switch (c_type) {
.longlong, .ulonglong, .double, .longdouble => return 4,
else => {},
},
.windows, .uefi => switch (c_type) {
.longdouble => switch (target.abi) {
.gnu, .gnuilp32, .ilp32, .cygnus => return 4,
else => return 8,
},
else => {},
},
else => switch (c_type) {
.longdouble => return 4,
else => {},
},
},
.wasm32, .wasm64 => switch (target.os.tag) {
.emscripten => switch (c_type) {
.longdouble => return 8,
else => {},
},
else => {},
},
else => {},
}
// Next-power-of-two-aligned, up to a maximum.
return @min(
std.math.ceilPowerOfTwoAssert(u16, (cTypeBitSize(target, c_type) + 7) / 8),
@as(u16, switch (target.cpu.arch) {
.msp430 => 2,
.csky,
.xcore,
.kalimba,
.xtensa,
.propeller,
=> 4,
.arc,
.arm,
.armeb,
.thumb,
.thumbeb,
.amdgcn,
.bpfel,
.bpfeb,
.hexagon,
.x86,
.m68k,
.mips,
.mipsel,
.sparc,
.lanai,
.nvptx,
.nvptx64,
.s390x,
=> 8,
.aarch64,
.aarch64_be,
.loongarch32,
.loongarch64,
.mips64,
.mips64el,
.powerpc,
.powerpcle,
.powerpc64,
.powerpc64le,
.riscv32,
.riscv64,
.sparc64,
.spirv,
.spirv32,
.spirv64,
.x86_64,
.ve,
.wasm32,
.wasm64,
=> 16,
.avr,
=> unreachable, // Handled above.
}),
);
}