Dan Gohman c2390b14c9 Teach IndVarSimplify to optimize code using the C "int" type for ... loop induction on LP64 targets. When the induction variable is used in addressing, IndVars now is usually able to inserst a 64-bit induction variable and eliminates the sign-extending cast. This is also useful for code using C "short" types for induction variables on targets with 32-bit addressing. Inserting a wider induction variable is easy; the tricky part is determining when trunc(sext(i)) expressions are no-ops. This requires range analysis of the loop trip count. A common case is when the original loop iteration starts at 0 and exits when the induction variable is signed-less-than a fixed value; this case is now handled. This replaces IndVarSimplify's OptimizeCanonicalIVType. It was doing the same optimization, but it was limited to loops with constant trip counts, because it was running after the loop rewrite, and the information about the original induction variable is lost by that point. Rename ScalarEvolution's executesAtLeastOnce to isLoopGuardedByCond, generalize it to be able to test for ICMP_NE conditions, and move it to be a public function so that IndVars can use it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64407 91177308-0d34-0410-b5e6-96231b3b80d8		2009-02-12 22:19:27 +00:00
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Analysis	Teach IndVarSimplify to optimize code using the C "int" type for	2009-02-12 22:19:27 +00:00
Archive	Add the private linkage.	2009-01-15 20:18:42 +00:00
AsmParser	Pacify gcc-4.3 (thinks IsConstant may be used	2009-02-10 16:24:55 +00:00
Bitcode	Add suppport for ConstantExprs of shufflevectors whose result type is not equal to the	2009-02-12 21:28:33 +00:00
CodeGen	Arrange to print constants that match "n" and "i" constraints	2009-02-12 20:58:09 +00:00
Debugger	Removed trailing whitespace from Makefiles.	2009-01-09 16:44:42 +00:00
ExecutionEngine	Split the locking out of JIT::runJITOnFunction so that callers	2009-02-06 21:25:08 +00:00
Linker	Add the private linkage.	2009-01-15 20:18:42 +00:00
Support	Add an API for strings with possible NULLs in the middle. Refactor the other	2009-02-07 04:57:08 +00:00
System	Fix MingW build, patch by Kenneth Boyd!	2009-02-12 07:39:10 +00:00
Target	Arrange to print constants that match "n" and "i" constraints	2009-02-12 20:58:09 +00:00
Transforms	Teach IndVarSimplify to optimize code using the C "int" type for	2009-02-12 22:19:27 +00:00
VMCore	Add suppport for ConstantExprs of shufflevectors whose result type is not equal to the	2009-02-12 21:28:33 +00:00
Makefile	Removed trailing whitespace from Makefiles.	2009-01-09 16:44:42 +00:00