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Use the new IsAligned fixup flag to improve fixup encodings for Thumb2 branches. This is still not perfect,

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but it gets many more of them correct than it did previously.

llvm-svn: 121414
This commit is contained in:
Owen Anderson 2010-12-09 21:34:47 +00:00
parent f7bba0cfe3
commit 4be3b6db5c
2 changed files with 4 additions and 2 deletions
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3
lib/Target/ARM/ARMAsmBackend.cpp
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@ -101,6 +101,7 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
case ARM::fixup_arm_ldst_pcrel_12:
// ARM PC-relative values are offset by 8.
Value -= 4;
// FALLTHROUGH
case ARM::fixup_t2_ldst_pcrel_12: {
// Offset by 4, adjusted by two due to the half-word ordering of thumb.
Value -= 4;
@ -140,7 +141,7 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
// Offset by 8 just as above.
return 0xffffff & ((Value - 8) >> 2);
case ARM::fixup_t2_branch: {
Value = Value - 8;
Value = Value - 6;
Value >>= 1; // Low bit is not encoded.
uint64_t out = 0;

3
lib/Target/ARM/ARMMCCodeEmitter.cpp
View File

@ -53,7 +53,8 @@ public:
{ "fixup_t2_pcrel_10", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_arm_adr_pcrel_12", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_arm_branch", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_t2_branch", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_t2_branch", 0, 32, MCFixupKindInfo::FKF_IsPCRel |
MCFixupKindInfo::FKF_IsAligned},
{ "fixup_arm_thumb_bl", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_arm_thumb_blx", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_arm_thumb_cb", 0, 16, MCFixupKindInfo::FKF_IsPCRel },