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Author SHA1 Message Date
Juergen Ributzka b2e4edb5c8 [ConstantHoisting][X86] Improve the cost model for small constants with large types (i64 and above). 
This improves the X86 cost model for small constants with large types. Before
this commit we would even hoist trivial constants such as i96 2.

This is related to <rdar://problem/17070936>

llvm-svn: 210504
 2014-06-10 00:32:29 +00:00
Juergen Ributzka 431761771c [ConstantHoisting][X86] Change the cost model to never hoist constants for types larger than i128. 
Currently the X86 backend doesn't support types larger than i128 very well. For
example an i192 multiply will assert in codegen when the 2nd argument is a constant and the constant got hoisted.

This fix changes the cost model to never hoist constants for types larger than
i128. Once the codegen issues have been resolved, the cost model can be updated
to allow also larger types.

This is related to <rdar://problem/16954938>

llvm-svn: 209162
 2014-05-19 21:00:53 +00:00
Michael Zolotukhin 1f4a960ccf [X86] Never hoist the shift value of a shift instruction. 
There is no need to check if we want to hoist the immediate value of an
shift instruction. Simply return TCC_Free right away.

This change is like r206101, but for X86.

rdar://problem/16190769

llvm-svn: 207692
 2014-04-30 19:17:32 +00:00