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Rollup merge of #132638 - taiki-e:ppc-asm-fixme, r=jieyouxu

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Remove fixme comment about clobber_abi on PowerPC

This was considered an unresolved question in https://github.com/rust-lang/rust/pull/131341, but according to the ABI document published in 2011 by Power.org the current implementation is fine as-is.
https://github.com/rust-lang/rust/pull/131341#discussion_r1829358396

> According to [Power Architecture 32-bit Application Binary Interface Supplement 1.0 - Linux & Embedded](https://web.archive.org/web/20120608163804/https://www.power.org/resources/downloads/Power-Arch-32-bit-ABI-supp-1.0-Unified.pdf) published in 2011, PPC32 has the same convention here as PPC64.
>
> Therefore, we can just remove the FIXME comment here.

r? workingjubilee
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Matthias Krüger 2024-11-07 18:19:37 +01:00 committed by GitHub
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1 changed files with 15 additions and 2 deletions
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17
compiler/rustc_target/src/asm/mod.rs
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@ -1128,6 +1128,21 @@ macro_rules! clobbered_regs {
},
InlineAsmClobberAbi::PowerPC => clobbered_regs! {
PowerPC PowerPCInlineAsmReg {
// Refs:
// - PPC32 SysV: "3.2. Function Calling Sequence" in Power Architecture® 32-bit Application Binary Interface Supplement 1.0 - Linux® & Embedded
// https://web.archive.org/web/20120608163804/https://www.power.org/resources/downloads/Power-Arch-32-bit-ABI-supp-1.0-Unified.pdf
// - PPC64 ELFv1: "3.2. Function Calling Sequence" in 64-bit PowerPC ELF Application Binary Interface Supplement 1.9
// https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html#FUNC-CALL
// - PPC64 ELFv2: "2.2 Function Calling Sequence" in 64-Bit ELF V2 ABI Specification: Power Architecture, Revision 1.5
// https://openpowerfoundation.org/specifications/64bitelfabi/
// - AIX:
// - Register usage and conventions
// https://www.ibm.com/docs/en/aix/7.3?topic=overview-register-usage-conventions
// - Special registers in the PowerPC®
// https://www.ibm.com/docs/en/aix/7.3?topic=overview-special-registers-in-powerpc
// - AIX vector programming
// https://www.ibm.com/docs/en/aix/7.3?topic=concepts-aix-vector-programming
// r0, r3-r12
r0,
r3, r4, r5, r6, r7,
@ -1138,8 +1153,6 @@ macro_rules! clobbered_regs {
f8, f9, f10, f11, f12, f13,
// v0-v19
// FIXME: PPC32 SysV ABI does not mention vector registers processing.
// https://refspecs.linuxfoundation.org/elf/elfspec_ppc.pdf
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10, v11, v12, v13, v14,
v15, v16, v17, v18, v19,