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https://github.com/c64scene-ar/llvm-6502.git
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bd48d31b37
Summary:
Highlights:
- Registers are resolved much later (by the render method).
Prior to that point, GPR32's/GPR64's are GPR's regardless of register
size. Similarly FGR32's/FGR64's/AFGR64's are FGR's regardless of register
size or FR mode. Numeric registers can be anything.
- All registers are parsed the same way everywhere (even when handling
symbol aliasing)
- One consequence is that all registers can be specified numerically
almost anywhere (e.g. $fccX, $wX). The exception is symbol aliasing
but that can be easily resolved.
- Removes the need for the hasConsumedDollar hack
- Parenthesis and Bracket suffixes are handled generically
- Micromips instructions are parsed directly instead of going through the
standard encodings first.
- rdhwr accepts all 32 registers, and the following instructions that previously
xfailed now work:
ddiv, ddivu, div, divu, cvt.l.[ds], se[bh], wsbh, floor.w.[ds], c.ngl.d,
c.sf.s, dsbh, dshd, madd.s, msub.s, nmadd.s, nmsub.s, swxc1
- Diagnostics involving registers point at the correct character (the $)
- There's only one kind of immediate in MipsOperand. LSA immediates are handled
by the predicate and renderer.
Lowlights:
- Hardcoded '$zero' in the div patterns is handled with a hack.
MipsOperand::isReg() will return true for a k_RegisterIndex token
with Index == 0 and getReg() will return ZERO for this case. Note that it
doesn't return ZERO_64 on isGP64() targets.
- I haven't cleaned up all of the now-unused functions.
Some more of the generic parser could be removed too (integers and relocs
for example).
- insve.df needed a custom decoder to handle the implicit fourth operand that
was needed to make it parse correctly. The difficulty was that the matcher
expected a Token<'0'> but gets an Imm<0>. Adding an implicit zero solved this.
Reviewers: matheusalmeida, vmedic
Reviewed By: matheusalmeida
Differential Revision: http://llvm-reviews.chandlerc.com/D3222
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205292 91177308-0d34-0410-b5e6-96231b3b80d8
43 lines
1.5 KiB
ArmAsm
43 lines
1.5 KiB
ArmAsm
# RUN: llvm-mc %s -triple=mipsel-unknown-linux -show-encoding -mcpu=mips32r2 \
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# RUN: 2>%t1 | FileCheck %s
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# RUN: FileCheck -check-prefix=WARNINGS %s < %t1
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# Check that the assembler can handle the documented syntax
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# for ".set at" and set the correct value. The correct value for $at is always
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# $1 when written by the user.
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.text
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foo:
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# CHECK: jr $1 # encoding: [0x08,0x00,0x20,0x00]
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# WARNINGS: :[[@LINE+2]]:11: warning: Used $at without ".set noat"
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.set at=$1
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jr $at
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# CHECK: jr $1 # encoding: [0x08,0x00,0x20,0x00]
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# WARNINGS: :[[@LINE+2]]:11: warning: Used $at without ".set noat"
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.set at=$1
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jr $1
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# WARNINGS-NOT: warning: Used $at without ".set noat"
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# CHECK: jr $1 # encoding: [0x08,0x00,0x20,0x00]
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.set at=$2
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jr $at
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# CHECK: jr $1 # encoding: [0x08,0x00,0x20,0x00]
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.set at=$3
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jr $at
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# CHECK: jr $1 # encoding: [0x08,0x00,0x20,0x00]
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.set noat
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jr $at
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# CHECK: jr $1 # encoding: [0x08,0x00,0x20,0x00]
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.set at=$0
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jr $at
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# CHECK: jr $16 # encoding: [0x08,0x00,0x00,0x02]
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# WARNINGS: :[[@LINE+2]]:11: warning: Used $16 with ".set at=$16"
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.set at=$16
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jr $s0
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# CHECK: jr $16 # encoding: [0x08,0x00,0x00,0x02]
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# WARNINGS: :[[@LINE+2]]:11: warning: Used $16 with ".set at=$16"
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.set at=$16
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jr $16
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# WARNINGS-NOT: warning
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