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Revision tags: llvmorg-21-init, llvmorg-19.1.7, llvmorg-19.1.6, llvmorg-19.1.5, llvmorg-19.1.4, llvmorg-19.1.3, llvmorg-19.1.2, llvmorg-19.1.1, llvmorg-19.1.0, llvmorg-19.1.0-rc4, llvmorg-19.1.0-rc3 |
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0d471b3f |
| 06-Aug-2024 |
weiguozhi <57237827+weiguozhi@users.noreply.github.com> |
Spill/restore FP/BP around instructions in which they are clobbered (#81048)
This patch fixes https://github.com/llvm/llvm-project/issues/17204.
If a base pointer is used in a function, and it is
Spill/restore FP/BP around instructions in which they are clobbered (#81048)
This patch fixes https://github.com/llvm/llvm-project/issues/17204.
If a base pointer is used in a function, and it is clobbered by an
instruction (typically an inline asm), current register allocator can't
handle this situation, so BP becomes garbage after those instructions.
It can also occur to FP in theory.
We can spill and reload FP/BP registers around those instructions. But
normal spill/reload instructions also use FP/BP, so we can't spill them
into normal spill slots, instead we spill them into the top of stack by
using SP register.
show more ...
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Revision tags: llvmorg-19.1.0-rc2, llvmorg-19.1.0-rc1, llvmorg-20-init, llvmorg-18.1.8, llvmorg-18.1.7, llvmorg-18.1.6, llvmorg-18.1.5, llvmorg-18.1.4, llvmorg-18.1.3, llvmorg-18.1.2, llvmorg-18.1.1, llvmorg-18.1.0, llvmorg-18.1.0-rc4, llvmorg-18.1.0-rc3, llvmorg-18.1.0-rc2, llvmorg-18.1.0-rc1, llvmorg-19-init, llvmorg-17.0.6 |
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| #
cb112eb1 |
| 27-Nov-2023 |
Shengchen Kan <shengchen.kan@intel.com> |
[X86][CodeGen] Teach frame lowering to spill/reload registers w/ PUSHP/POPP, PUSH2[P]/POP2[P] (#73292)
#73092 supported the encoding/decoding for PUSHP/POPP
#73233 supported the encoding/decoding f
[X86][CodeGen] Teach frame lowering to spill/reload registers w/ PUSHP/POPP, PUSH2[P]/POP2[P] (#73292)
#73092 supported the encoding/decoding for PUSHP/POPP
#73233 supported the encoding/decoding for PUSH2[P]/POP2[P]
In this patch, we teach frame lowering to spill/reload registers w/
these instructions.
1. Use PPX for balanced spill/reload
2. Use PUSH2/POP2 for continuous spills/reloads
3. PUSH2/POP2 must be 16B-aligned on the stack, so pad when necessary
show more ...
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