# SCM Repository

# View of /sml/trunk/src/MLRISC/hppa/README.hppa

Parent Directory | Revision Log

Revision

File size: 1301 byte(s)

**409**- (**download**) (**annotate**)*Fri Sep 3 00:21:52 1999 UTC*(19 years, 10 months ago) by*monnier*File size: 1301 byte(s)

Initial revision

Additions to the instruction set ===================================== 1. SHnADD[O] instructions, which performs a*(2^n)+b 2. Branch on bit instruction (BB) 3. Single precision floating points + lots of other conversion ops 4. Loads and stores with scaled indexed and auto increment addressing modes New optimizations in the HPPA backend ===================================== 1. An expressions such as a*n+b where n = 2, 4, and 8 now emits SHnADD[O] instructions. 2. An expression such as BCC(T.CMP(T.NE,0,T.ANDB(mask,e)) where mask is a power of 2 now emits BB instructions. SML/NJ: this improves boxity testing code by replacing 3 instructions with 1 instruction. 3. Strength reduction for multiplication with small constants. SML/NJ: benefits array indexing and multiway branches 4 Addressing modes computation now takes into account of scaled indexed mode. Unfortunately, due to tagging this optimizations is not used in SML/NJ. 5 Propagation of annotations 6 Delay slot filling has been added 7 NOTB folding has been implemented. This combines NOTB with other bit ops such as ANDB, ORB, XORB. 8. COND expressions now generate the composite instruction sequence: COMCLR,cc r1, r2, t LDO i(b), t

root@smlnj-gforge.cs.uchicago.edu | ViewVC Help |

Powered by ViewVC 1.0.0 |