llvm/lib at 2a821601f1db665fbb825727aacf1a54d17b91ef - llvm

RPCS3/llvm

mirror of https://github.com/RPCS3/llvm.git synced 2025-01-20 17:03:09 +00:00

History

Chris Lattner 2a821601f1 Allow the getRegForInlineAsmConstraint method to return a register class with

no fixes physreg.  Treat this as permission to use any register in the register
class.  When this happens and it is safe, allow the llvm register allcoator to
allocate the register instead of doing it at isel time.  This eliminates a ton
of copies around common inline asms.  For example:

int test2(int Y, int X) {
  asm("foo %0, %1" : "=r"(X): "r"(X));
  return X;
}

now compiles to:

_test2:
        foo r3, r4
        blr

instead of:

_test2:
        mr r2, r4
        foo r2, r2
        mr r3, r2
        blr

GCC produces:

_test2:
        foo r4, r4
        mr r3,r4
        blr


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31366 91177308-0d34-0410-b5e6-96231b3b80d8

2006-11-02 01:41:49 +00:00

Analysis

Make ScalarEvolution actually use a ZeroExtend expression instead of

2006-11-01 21:53:12 +00:00