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std.Target: Some corrections and additions to stackAlignment().

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Sourced from LLVM and GCC backends and ABI documents.
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Alex Rønne Petersen 2024-08-07 01:38:46 +02:00 committed by Andrew Kelley
parent 8161e61548
commit 25096ed893
1 changed files with 32 additions and 24 deletions
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56
lib/std/Target.zig
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@ -1930,45 +1930,53 @@ pub fn ptrBitWidth(target: Target) u16 {
}
pub fn stackAlignment(target: Target) u16 {
return switch (target.cpu.arch) {
.m68k => 2,
.amdgcn => 4,
.x86 => switch (target.os.tag) {
.windows, .uefi => 4,
else => 16,
},
.arm,
.armeb,
.thumb,
.thumbeb,
// Overrides for when the stack alignment is not equal to the pointer width.
switch (target.cpu.arch) {
.m68k,
=> return 2,
.amdgcn,
=> return 4,
.lanai,
.mips,
.mipsel,
.sparc,
=> 8,
=> return 8,
.aarch64,
.aarch64_be,
.bpfeb,
.bpfel,
.loongarch32,
.loongarch64,
.mips64,
.mips64el,
.riscv64,
.sparc64,
.x86_64,
.ve,
.wasm32,
.wasm64,
.loongarch64,
=> 16,
.riscv32,
=> if (Target.riscv.featureSetHas(target.cpu.features, .e)) 4 else 16,
=> return 16,
// Some of the following prongs should really be testing the ABI (e.g. for Arm, it's APCS vs
// AAPCS16 vs AAPCS). But our current Abi enum is not able to handle that level of nuance.
.arm,
.armeb,
.thumb,
.thumbeb,
=> switch (target.os.tag) {
.netbsd => {},
.watchos => return 16,
else => return 8,
},
.powerpc64,
.powerpc64le,
=> switch (target.os.tag) {
else => 8,
.linux => 16,
},
else => @divExact(target.ptrBitWidth(), 8),
};
=> if (target.os.tag == .linux or target.os.tag == .aix) return 16,
.riscv32,
.riscv64,
=> if (!Target.riscv.featureSetHas(target.cpu.features, .e)) return 16,
.x86 => if (target.os.tag != .windows and target.os.tag != .uefi) return 16,
.x86_64 => return if (target.os.tag == .elfiamcu) 4 else 16,
else => {},
}
return @divExact(target.ptrBitWidth(), 8);
}
/// Default signedness of `char` for the native C compiler for this target