2012-02-18 12:03:15 +00:00
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//=- X86InstComments.h - Generate verbose-asm comments for instrs -*- C++ -*-=//
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I have manually decoded the imm field of an insertps one too many
times. This patch causes llc and llvm-mc (which both default to
verbose-asm) to print out comments after a few common shuffle
instructions which indicates the shuffle mask, e.g.:
insertps $113, %xmm3, %xmm0 ## xmm0 = zero,xmm0[1,2],xmm3[1]
unpcklps %xmm1, %xmm0 ## xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1]
pshufd $1, %xmm1, %xmm1 ## xmm1 = xmm1[1,0,0,0]
This is carefully factored to keep the information extraction (of the
shuffle mask) separate from the printing logic. I plan to move the
extraction part out somewhere else at some point for other parts of
the x86 backend that want to introspect on the behavior of shuffles.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112387 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-28 20:42:31 +00:00
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This defines functionality used to emit comments about X86 instructions to
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// an output stream for -fverbose-asm.
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//
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//===----------------------------------------------------------------------===//
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#ifndef X86_INST_COMMENTS_H
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#define X86_INST_COMMENTS_H
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namespace llvm {
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class MCInst;
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class raw_ostream;
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void EmitAnyX86InstComments(const MCInst *MI, raw_ostream &OS,
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const char *(*getRegName)(unsigned));
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}
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#endif
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