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Commit Graph

6 Commits

Author SHA1 Message Date
Venkatraman Govindaraju
acb910b7ae Sparc: Perform leaf procedure optimization by default
llvm-svn: 183083
2013-06-02 02:24:27 +00:00
Jakob Stoklund Olesen
6a275455ac Compute correct frame sizes for SPARC v9 64-bit frames.
The save area is twice as big and there is no struct return slot. The
stack pointer is always 16-byte aligned (after adding the bias).

Also eliminate the stack adjustment instructions around calls when the
function has a reserved stack frame.

llvm-svn: 179083
2013-04-09 04:37:47 +00:00
Jakob Stoklund Olesen
658f7754a3 Implement LowerCall_64 for the SPARC v9 64-bit ABI.
There is still no support for byval arguments (which I don't think are
needed) and varargs.

llvm-svn: 178993
2013-04-07 19:10:57 +00:00
Jakob Stoklund Olesen
594e073ba0 Implement LowerReturn_64 for SPARC v9.
Integer return values are sign or zero extended by the callee, and
structs up to 32 bytes in size can be returned in registers.

The CC_Sparc64 CallingConv definition is shared between
LowerFormalArguments_64 and LowerReturn_64. Function arguments and
return values are passed in the same registers.

The inreg flag is also used for return values. This is required to handle
C functions returning structs containing floats and ints:

  struct ifp {
    int i;
    float f;
  };

  struct ifp f(void);

LLVM IR:

  define inreg { i32, float } @f() {
     ...
     ret { i32, float } %retval
  }

The ABI requires that %retval.i is returned in the high bits of %i0
while %retval.f goes in %f1.

Without the inreg return value attribute, %retval.i would go in %i0 and
%retval.f would go in %f3 which is a more efficient way of returning
%multiple values, but it is not ABI compliant for returning C structs.

llvm-svn: 178966
2013-04-06 23:57:33 +00:00
Jakob Stoklund Olesen
2e3d792bf5 SPARC v9 stack pointer bias.
64-bit SPARC v9 processes use biased stack and frame pointers, so the
current function's stack frame is located at %sp+BIAS .. %fp+BIAS where
BIAS = 2047.

This makes more local variables directly accessible via [%fp+simm13]
addressing.

llvm-svn: 178965
2013-04-06 21:38:57 +00:00
Jakob Stoklund Olesen
2076ffbc15 Complete formal arguments for the SPARC v9 64-bit ABI.
All arguments are formally assigned to stack positions and then promoted
to floating point and integer registers. Since there are more floating
point registers than integer registers, this can cause situations where
floating point arguments are assigned to registers after integer
arguments that where assigned to the stack.

Use the inreg flag to indicate 32-bit fragments of structs containing
both float and int members.

The three-way shadowing between stack, integer, and floating point
registers requires custom argument lowering. The good news is that
return values are passed in the exact same way, and we can share the
code.

Still missing:

 - Update LowerReturn to handle structs returned in registers.
 - LowerCall.
 - Variadic functions.

llvm-svn: 178958
2013-04-06 18:32:12 +00:00