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[AMDGPU] Fix s_branch with -1 offset

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Summary:
In case s_branch instruction target is itself backend should emit offset -1 but instead it emit 0.
'''
label:
    s_branch label  // should emit [0xff,0xff,0x82,0xbf]
'''

Tom, Matt: why are we adjusting fixup values in applyFixup() method instead of processFixup()? processFixup() is calling adjustFixupValue() but does nothing with its result.

Reviewers: vpykhtin, artem.tamazov, tstellarAMD

Subscribers: arsenm, kzhuravl, wdng, nhaehnle, yaxunl

Differential Revision: https://reviews.llvm.org/D24671

llvm-svn: 281896
This commit is contained in:
Sam Kolton 2016-09-19 10:20:55 +00:00
parent 64915fd385
commit dc0750f4ac
2 changed files with 9 additions and 5 deletions
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7
lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp
View File

@ -133,24 +133,21 @@ void AMDGPUAsmBackend::processFixupValue(const MCAssembler &Asm,
const MCValue &Target, uint64_t &Value,
bool &IsResolved) {
if (IsResolved)
(void)adjustFixupValue(Fixup, Value, &Asm.getContext());
Value = adjustFixupValue(Fixup, Value, &Asm.getContext());
}
void AMDGPUAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
unsigned DataSize, uint64_t Value,
bool IsPCRel) const {
unsigned NumBytes = getFixupKindNumBytes(Fixup.getKind());
if (!Value)
return; // Doesn't change encoding.
Value = adjustFixupValue(Fixup, Value, nullptr);
MCFixupKindInfo Info = getFixupKindInfo(Fixup.getKind());
// Shift the value into position.
Value <<= Info.TargetOffset;
unsigned NumBytes = getFixupKindNumBytes(Fixup.getKind());
uint32_t Offset = Fixup.getOffset();
assert(Offset + NumBytes <= DataSize && "Invalid fixup offset!");

7
test/MC/AMDGPU/labels-branch.s
View File

@ -1,17 +1,24 @@
// RUN: llvm-mc -arch=amdgcn -mcpu=fiji -show-encoding %s | FileCheck %s --check-prefix=VI
// RUN: llvm-mc -arch=amdgcn -mcpu=fiji -filetype=obj %s | llvm-objdump -disassemble -mcpu=fiji - | FileCheck %s --check-prefix=BIN
loop_start:
s_branch loop_start
// VI: s_branch loop_start ; encoding: [A,A,0x82,0xbf]
// VI-NEXT: ; fixup A - offset: 0, value: loop_start, kind: fixup_si_sopp_br
// BIN: loop_start:
// BIN-NEXT: BF82FFFF
s_branch loop_end
// VI: s_branch loop_end ; encoding: [A,A,0x82,0xbf]
// VI-NEXT: ; fixup A - offset: 0, value: loop_end, kind: fixup_si_sopp_br
// BIN: BF820000
// BIN: loop_end:
loop_end:
s_branch gds
// VI: s_branch gds ; encoding: [A,A,0x82,0xbf]
// VI-NEXT: ; fixup A - offset: 0, value: gds, kind: fixup_si_sopp_br
// BIN: BF820000
// BIN: gds:
gds:
s_nop 0