Support hardware divide instruction
Bug: 11299025
Uses sdiv for division and a combo of sdiv, mul and sub for modulus.
Only does this on processors that are capable of the sdiv instruction, as determined
by the build system.
Also provides a command line arg --instruction-set-features= to allow cross compilation.
Makefile adds the --instruction-set-features= arg to build-time dex2oat runs and defaults
it to something obtained from the target architecture.
Provides a GetInstructionSetFeatures() function on CompilerDriver that can be
queried for various features. The only feature supported right now is hasDivideInstruction().
Also adds a few more instructions to the ARM disassembler
b/11535253 is an addition to this CL to be done later.
Change-Id: Ia8aaf801fd94bc71e476902749cf20f74eba9f68
diff --git a/compiler/dex/quick/arm/utility_arm.cc b/compiler/dex/quick/arm/utility_arm.cc
index 3ceeacf..d631cf7 100644
--- a/compiler/dex/quick/arm/utility_arm.cc
+++ b/compiler/dex/quick/arm/utility_arm.cc
@@ -395,6 +395,10 @@
DCHECK_EQ(shift, 0);
opcode = kThumb2MulRRR;
break;
+ case kOpDiv:
+ DCHECK_EQ(shift, 0);
+ opcode = kThumb2SdivRRR;
+ break;
case kOpOr:
opcode = kThumb2OrrRRR;
break;