Chris Lattner 16e36659f5 Extend CanEvaluateZExtd to handle and/or/xor more aggressively in the ... BitsToClear case. This allows it to promote expressions which have an and/or/xor after the lshr, promoting cases like test2 (from PR4216) and test3 (random extample extracted from a spec benchmark). clang now compiles the code in PR4216 into: _test_bitfield: ## @test_bitfield movl %edi, %eax orl $194, %eax movl $4294902010, %ecx andq %rax, %rcx orl $32768, %edi andq $39936, %rdi movq %rdi, %rax orq %rcx, %rax ret instead of: _test_bitfield: ## @test_bitfield movl %edi, %eax orl $194, %eax movl $4294902010, %ecx andq %rax, %rcx shrl $8, %edi orl $128, %edi shlq $8, %rdi andq $39936, %rdi movq %rdi, %rax orq %rcx, %rax ret which is still not great, but is progress. llvm-svn: 93145		2010-01-11 04:05:13 +00:00
..
Hello	Fix a bunch of little errors that Clang complains about when its being pedantic	2009-12-19 07:05:23 +00:00
InstCombine	Extend CanEvaluateZExtd to handle and/or/xor more aggressively in the	2010-01-11 04:05:13 +00:00
Instrumentation	Move remaining stuff to the isInteger predicate.	2010-01-05 21:05:54 +00:00
IPO	Be less stingy as to how many selects and phi nodes we	2010-01-07 05:48:42 +00:00
Scalar	only factor from expressions whose uses are empty and whose	2010-01-09 06:01:36 +00:00
Utils	Fix nondeterministic behavior.	2010-01-10 01:07:22 +00:00
Makefile	move instcombine to its own library, it's past time.	2010-01-04 06:23:24 +00:00