Yuanfang Chen ece79f4708 [X86] make sure POP has implicit def/use of stack pointer when materializing 8-bit immediates for minsize ...

Summary:
Otherwise PostRA list scheduler may reorder instruction, such as

schedule this
'''
pushq  $0x8
pop    %rbx
lea    0x2a0(%rsp),%r15
'''
to
'''
pushq  $0x8
lea    0x2a0(%rsp),%r15
pop    %rbx
'''
by mistake. The patch is to prevent this to happen by making sure POP has
implicit use of SP.

Reviewers: craig.topper

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77031

2020-03-30 09:25:31 -07:00

9.5 KiB

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