forked from OSchip/llvm-project
d081962dea
Summary: Detect a run of memory tagging instructions for adjacent stack frame slots, and replace them with a shorter instruction sequence * replace STG + STG with ST2G * replace STGloop + STGloop with STGloop This code needs to run when stack slot offsets are already known, but before FrameIndex operands in STG instructions are eliminated; that's the reason for the new hook in PrologueEpilogue. This change modifies STGloop and STZGloop pseudos to take the size as an immediate integer operand, and adds _untied variants of those pseudos that are allowed to take the base address as a FI operand. This is needed to simplify recognizing an STGloop instruction as operating on a stack slot post-regalloc. This improves memtag code size by ~0.25%, and it looks like an additional ~0.1% is possible by rearranging the stack frame such that consecutive STG instructions reference adjacent slots (patch pending). Reviewers: pcc, ostannard Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D70286 |
||
|---|---|---|
| .. | ||
| AArch64 | ||
| AMDGPU | ||
| ARC | ||
| ARM | ||
| AVR | ||
| BPF | ||
| Generic | ||
| Hexagon | ||
| Inputs | ||
| Lanai | ||
| MIR | ||
| MSP430 | ||
| Mips | ||
| NVPTX | ||
| PowerPC | ||
| RISCV | ||
| SPARC | ||
| SystemZ | ||
| Thumb | ||
| Thumb2 | ||
| VE | ||
| WebAssembly | ||
| WinCFGuard | ||
| WinEH | ||
| X86 | ||
| XCore | ||