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Fix bitfield decoding based on Eli's feedback.
author
Owen Anderson
<resistor@mac.com>
Fri, 16 Sep 2011 23:04:48 +0000
(23:04 +0000)
committer
Owen Anderson
<resistor@mac.com>
Fri, 16 Sep 2011 23:04:48 +0000
(23:04 +0000)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139969
91177308
-0d34-0410-b5e6-
96231b3b80d8
lib/Target/ARM/Disassembler/ARMDisassembler.cpp
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diff --git
a/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
b/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
index d1eb5b3004bf0356d87602b5d8b04fe03323a843..4e9c3e58a5f3cbeb59bff60c783af782a2fb76af 100644
(file)
--- a/
lib/Target/ARM/Disassembler/ARMDisassembler.cpp
+++ b/
lib/Target/ARM/Disassembler/ARMDisassembler.cpp
@@
-1004,10
+1004,9
@@
static DecodeStatus DecodeBitfieldMaskOperand(llvm::MCInst &Inst, unsigned Val,
unsigned msb = fieldFromInstruction32(Val, 5, 5);
unsigned lsb = fieldFromInstruction32(Val, 0, 5);
- uint32_t msb_mask = (1 << (msb+1)) - 1;
- if (msb == 31) msb_mask = 0xFFFFFFFF;
- uint32_t lsb_mask = (1 << lsb) - 1;
- if (lsb == 31) lsb_mask = 0xFFFFFFFF;
+ uint32_t msb_mask = 0xFFFFFFFF;
+ if (msb != 31) msb_mask = (1U << (msb+1)) - 1;
+ uint32_t lsb_mask = (1U << lsb) - 1;
Inst.addOperand(MCOperand::CreateImm(~(msb_mask ^ lsb_mask)));
return MCDisassembler::Success;