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Add PPC option for full register names in asm

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On non-Darwin PPC systems, we currently strip off the register name prefix
prior to instruction printing. So instead of something like this:

  mr r3, r4

we print this:

  mr 3, 4

The first form is the default on Darwin, and is understood by binutils, but not
yet understood by our integrated assembler. Once our integrated-as understands
full register names as well, this temporary option will be replaced by tying
this functionality to the verbose-asm option. The numeric-only form is
compatible with legacy assemblers and tools, and is also gcc's default on most
PPC systems. On the other hand, it is harder to read, and there are some
analysis tools that expect full register names.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194384 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2013-11-11 14:58:40 +00:00
parent 877ca3418f
commit f14beced2b
2 changed files with 27 additions and 0 deletions
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10
lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
View File

@ -18,10 +18,17 @@
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetOpcodes.h"
using namespace llvm;
// FIXME: Once the integrated assembler supports full register names, tie this
// to the verbose-asm setting.
static cl::opt<bool>
FullRegNames("ppc-asm-full-reg-names", cl::Hidden, cl::init(false),
cl::desc("Use full register names when printing assembly"));
#include "PPCGenAsmWriter.inc"
void PPCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
@ -297,6 +304,9 @@ void PPCInstPrinter::printTLSCall(const MCInst *MI, unsigned OpNo,
/// stripRegisterPrefix - This method strips the character prefix from a
/// register name so that only the number is left. Used by for linux asm.
static const char *stripRegisterPrefix(const char *RegName) {
if (FullRegNames)
return RegName;
switch (RegName[0]) {
case 'r':
case 'f':

17
test/CodeGen/PowerPC/reg-names.ll Normal file
View File

@ -0,0 +1,17 @@
; RUN: llc -mtriple=powerpc64-unknown-linux-gnu < %s | FileCheck %s
; RUN: llc -mtriple=powerpc64-unknown-linux-gnu -ppc-asm-full-reg-names < %s | FileCheck -check-prefix=CHECK-FN %s
define i64 @test1(i64 %a, i64 %b) {
; CHECK-LABEL: @test1
; CHECK-FN-LABEL: @test1
entry:
ret i64 %b
; CHECK: mr 3, 4
; CHECK-FN: mr r3, r4
; CHECK: blr
; CHECK-FN: blr
}