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Author SHA1 Message Date
Weiming Zhao 0da5cc0765 Enable generating legacy IT block for AArch32 
By default, the behavior of IT block generation will be determinated
dynamically base on the arch (armv8 vs armv7). This patch adds backend
options: -arm-restrict-it and -arm-no-restrict-it.  The former one
restricts the generation of IT blocks (the same behavior as thumbv8) for
both arches. The later one allows the generation of legacy IT block (the
same behavior as ARMv7 Thumb2) for both arches.

Clang will support -mrestrict-it and -mno-restrict-it, which is
compatible with GCC.

llvm-svn: 194592
 2013-11-13 18:29:49 +00:00
Joey Gouly a5153cb025 [ARMv8] Prevent generation of deprecated IT blocks on ARMv8 in Thumb mode. 
IT blocks can only be one instruction lonf, and can only contain a subset of
the 16 instructions.

Patch by Artyom Skrobov!

llvm-svn: 190309
 2013-09-09 14:21:49 +00:00