[all-commits] [llvm/llvm-project] 9cf30e: [AArch64][PAC] Eliminate excessive MOVs when compu...
Anatoly Trosinenko via All-commits
all-commits at lists.llvm.org
Tue Nov 12 04:56:23 PST 2024
Branch: refs/heads/users/atrosinenko/pauth-discriminator
Home: https://github.com/llvm/llvm-project
Commit: 9cf30ea74f2f0d4ddc042224c65811ce682f0275
https://github.com/llvm/llvm-project/commit/9cf30ea74f2f0d4ddc042224c65811ce682f0275
Author: Anatoly Trosinenko <atrosinenko at accesssoftek.com>
Date: 2024-11-12 (Tue, 12 Nov 2024)
Changed paths:
M llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
M llvm/lib/Target/AArch64/AArch64InstrInfo.td
M llvm/test/CodeGen/AArch64/ptrauth-call.ll
Log Message:
-----------
[AArch64][PAC] Eliminate excessive MOVs when computing blend
As function calls do not generally preserve X16 and X17, it is beneficial
to allow AddrDisc operand of B(L)RA instruction to reside in these
registers and make use of this condition when computing the discriminator.
This can save up to two MOVs in cases such as loading a (signed) virtual
function pointer via a (signed) pointer to vtable, for example
ldr x9, [x16]
mov x8, x16
mov x17, x8
movk x17, #34646, lsl #48
blraa x9, x17
can be simplified to
ldr x8, [x16]
movk x16, #34646, lsl #48
blraa x8, x16
Commit: 084f0b04e38bb334d400eabe7eb66ebf9dde7211
https://github.com/llvm/llvm-project/commit/084f0b04e38bb334d400eabe7eb66ebf9dde7211
Author: Anatoly Trosinenko <atrosinenko at accesssoftek.com>
Date: 2024-11-12 (Tue, 12 Nov 2024)
Changed paths:
M llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
M llvm/lib/Target/AArch64/AArch64InstrInfo.td
Log Message:
-----------
Fixes
Compare: https://github.com/llvm/llvm-project/compare/05c9852d7e27...084f0b04e38b
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