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[PowerPC] Implement writeNopData

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This implements a proper PPCAsmBackend::writeNopData routine
that actually writes PowerPC nop instructions.

This fixes the last remaining difference in object file output
(text section) between the integrated assembler and GNU as
that I've seen anywhere.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185662 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ulrich Weigand 2013-07-04 18:28:46 +00:00
parent 449f64c69c
commit 972befb3f2
2 changed files with 17 additions and 4 deletions
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12
lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
View File

@ -148,10 +148,14 @@ public:
}
bool writeNopData(uint64_t Count, MCObjectWriter *OW) const {
// FIXME: Zero fill for now. That's not right, but at least will get the
// section size right.
for (uint64_t i = 0; i != Count; ++i)
OW->Write8(0);
// Can't emit NOP with size not multiple of 32-bits
if (Count % 4 != 0)
return false;
uint64_t NumNops = Count / 4;
for (uint64_t i = 0; i != NumNops; ++i)
OW->Write32(0x60000000);
return true;
}

9
test/MC/PowerPC/ppc-nop.s Normal file
View File

@ -0,0 +1,9 @@
# RUN: llvm-mc -filetype=obj -triple=powerpc-unknown-linux-gnu %s | llvm-readobj -s -sd - | FileCheck %s
# RUN: llvm-mc -filetype=obj -triple=powerpc64-unknown-linux-gnu %s | llvm-readobj -s -sd - | FileCheck %s
blr
.p2align 3
blr
# CHECK: 0000: 4E800020 60000000 4E800020