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Add docs and tests for copy_special instruction. Fixes encoding issue that tests revealed.

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This commit is contained in:
Tyler McMullen
2017-12-01 18:01:00 -08:00
committed by Jakob Stoklund Olesen
parent 4eb9a54096
commit 3b1b33e0ac
6 changed files with 41 additions and 4 deletions
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7
lib/cretonne/meta/base/instructions.py
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@@ -539,7 +539,12 @@ regmove = Instruction(
copy_special = Instruction(
'copy_special', r"""
Copies a value from one special register to another. e.g. rbp -> rsp.
Copies the contents of ''src'' register to ''dst'' register.
This instructions copies the contents of one register to another
register without involving any SSA values. This is used for copying
special registers, e.g. copying the stack register to the frame
register in a function prologue.
""",
ins=(src, dst),
other_side_effects=True)

2
lib/cretonne/meta/isa/intel/encodings.py
View File

@@ -232,7 +232,7 @@ enc_i32_i64(x86.push, r.pushq, 0x50)
enc_i32_i64(x86.pop, r.popq, 0x58)
# Copy Special
enc_i64(base.copy_special, r.copysp, 0x89, w=1)
I64.enc(base.copy_special, *r.copysp.rex(0x89, w=1))
I32.enc(base.copy_special, *r.copysp(0x89))
# Adjust SP Imm