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Constants with multiple encodings (ARM):

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An alternative syntax is available for a modified immediate constant that permits the programmer to specify
the encoding directly. In this syntax, #<const> is instead written as #<byte>,#<rot>, where:

    <byte> is the numeric value of abcdefgh, in the range 0-255
    <rot> is twice the numeric value of rotation, an even number in the range 0-30.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128897 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Johnny Chen
2011-04-05 18:02:46 +00:00
parent b26d8d7c49
commit 12bb2958c4
3 changed files with 9 additions and 8 deletions
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5
lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
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@@ -136,9 +136,10 @@ static void printSOImm(raw_ostream &O, int64_t V, raw_ostream *CommentStream,
unsigned Rot = ARM_AM::getSOImmValRot(V);
// Print low-level immediate formation info, per
// A5.1.3: "Data-processing operands - Immediate".
// A5.2.3: Data-processing (immediate), and
// A5.2.4: Modified immediate constants in ARM instructions
if (Rot) {
O << "#" << Imm << ", " << Rot;
O << "#" << Imm << ", #" << Rot;
// Pretty printed version.
if (CommentStream)
*CommentStream << (int)ARM_AM::rotr32(Imm, Rot) << "\n";