5 Commits

Author	SHA1	Message	Date
Dan Gohman	72a13d2476	Use opt -S instead of piping bitcode output through llvm-dis. ... llvm-svn: 81257	2009-09-08 22:34:10 +00:00
Dan Gohman	9737a63ed8	Change these tests to feed the assembly files to opt directly, instead ... of using llvm-as, now that opt supports this. llvm-svn: 81226	2009-09-08 16:50:01 +00:00
Wojciech Matyjewicz	d2d9764cc8	Fix PR1798 - an error in the evaluation of SCEVAddRecExpr at an ... arbitrary iteration. The patch: 1) changes SCEVSDivExpr into SCEVUDivExpr, 2) replaces PartialFact() function with BinomialCoefficient(); the computations (essentially, the division) in BinomialCoefficient() are performed with the apprioprate bitwidth necessary to avoid overflow; unsigned division is used instead of the signed one. Computations in BinomialCoefficient() require support from the code generator for APInts. Currently, we use a hack rounding up the neccessary bitwidth to the nearest power of 2. The hack is easy to turn off in future. One remaining issue: we assume the divisor of the binomial coefficient formula can be computed accurately using 16 bits. It means we can handle AddRecs of length up to 9. In future, we should use APInts to evaluate the divisor. Thanks to Nicholas for cooperation! llvm-svn: 46955	2008-02-11 11:03:14 +00:00
Anton Korobeynikov	6a7ddfdb8f	Reverted r44163 per request ... llvm-svn: 44177	2007-11-15 18:33:16 +00:00
Nick Lewycky	fbb24817cc	Fix handling of overflow in loop calculation by adding new UDiv SCEV. This SCEV ... is disabled in the sense that it will refuse to create one from a UDiv instruction, until the code is better tested. llvm-svn: 44163	2007-11-15 06:30:50 +00:00