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  1. Mar 23, 2006
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  7. Jul 06, 2005
    • Nate Begeman's avatar
      First round of support for doing scalar FP using the SSE2 ISA extension and · 8a093360
      Nate Begeman authored 
      XMM registers.  There are many known deficiencies and fixmes, which will be
addressed ASAP.  The major benefit of this work is that it will allow the
LLVM register allocator to allocate FP registers across basic blocks.

The x86 backend will still default to x87 style FP.  To enable this work,
you must pass -enable-sse-scalar-fp and either -sse2 or -sse3 to llc.

An example before and after would be for:
double foo(double *P) { double Sum = 0; int i; for (i = 0; i < 1000; ++i)
                        Sum += P[i]; return Sum; }

The inner loop looks like the following:
x87:
.LBB_foo_1:     # no_exit
        fldl (%esp)
        faddl (%eax,%ecx,8)
        fstpl (%esp)
        incl %ecx
        cmpl $1000, %ecx
        #FP_REG_KILL
        jne .LBB_foo_1  # no_exit

SSE2:
        addsd (%eax,%ecx,8), %xmm0
        incl %ecx
        cmpl $1000, %ecx
        #FP_REG_KILL
        jne .LBB_foo_1  # no_exit

llvm-svn: 22340
      8a093360
  9. May 13, 2005
  11. Apr 30, 2005
  13. Apr 22, 2005
  15. Apr 16, 2005
    • Nate Begeman's avatar
      Make pattern isel default for ppc · 779c5cbb
      Nate Begeman authored 
      Add new ppc beta option related to using condition registers
Make pattern isel control flag (-enable-pattern-isel) global and tristate
  0 == off
  1 == on
  2 == target default

llvm-svn: 21309
      779c5cbb
  17. Jan 15, 2005
  19. Sep 02, 2004
    • Reid Spencer's avatar
      Changes For Bug 352 · 7c16caa3
      Reid Spencer authored 
      Move include/Config and include/Support into include/llvm/Config,
include/llvm/ADT and include/llvm/Support. From here on out, all LLVM
public header files must be under include/llvm/.

llvm-svn: 16137
      7c16caa3
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