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re PR target/21981 ([4.0 only] __m64 return value should be returned in %mm0) 

PR target/21981
	* config/i386/i386.c (ix86_function_value_regno_p): Return true
	for FIRST_MMX_REG if TARGET_MMX.
	(ix86_return_in_memory): Return 1 for MMX/3dNow vectors. Delete
	wrong comment.
	(ix86_struct_value_rtx): Emit warning for MMX ABI violations.
	(ix86_value_regno): Return FIRST_MMX_REG for MMX vector modes.

From-SVN: r100832
This commit is contained in:
Uros Bizjak 2005-06-10 23:45:12 +02:00 committed by Richard Henderson
parent c45af542bd
commit 74c4a88aff
2 changed files with 39 additions and 9 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,13 @@
2005-06-10 Uros Bizjak <uros@kss-loka.si>
PR target/21981
* config/i386/i386.c (ix86_function_value_regno_p): Return true
for FIRST_MMX_REG if TARGET_MMX.
(ix86_return_in_memory): Return 1 for MMX/3dNow vectors. Delete
wrong comment.
(ix86_struct_value_rtx): Emit warning for MMX ABI violations.
(ix86_value_regno): Return FIRST_MMX_REG for MMX vector modes.
2005-06-10 Daniel Berlin <dberlin@dberlin.org>
* lambda-code.c (replace_uses_equiv_to_x_with_y): Check step

38
gcc/config/i386/i386.c
View File

@ -3104,6 +3104,7 @@ ix86_function_value_regno_p (int regno)
{
return ((regno) == 0
|| ((regno) == FIRST_FLOAT_REG && TARGET_FLOAT_RETURNS_IN_80387)
|| ((regno) == FIRST_MMX_REG && TARGET_MMX)
|| ((regno) == FIRST_SSE_REG && TARGET_SSE));
}
return ((regno) == 0 || (regno) == FIRST_FLOAT_REG
@ -3159,10 +3160,10 @@ ix86_return_in_memory (tree type)
if (size < 8)
return 0;
/* MMX/3dNow values are returned on the stack, since we've
got to EMMS/FEMMS before returning. */
/* MMX/3dNow values are returned in MM0,
except when it doesn't exits. */
if (size == 8)
return 1;
return (TARGET_MMX ? 0 : 1);
/* SSE values are returned in XMM0, except when it doesn't exist. */
if (size == 16)
@ -3191,18 +3192,32 @@ ix86_return_in_memory (tree type)
static rtx
ix86_struct_value_rtx (tree type, int incoming ATTRIBUTE_UNUSED)
{
static bool warned;
static bool warnedsse, warnedmmx;
if (!TARGET_SSE && type && !warned)
if (type)
{
/* Look at the return type of the function, not the function type. */
enum machine_mode mode = TYPE_MODE (TREE_TYPE (type));
if (mode == TImode
|| (VECTOR_MODE_P (mode) && GET_MODE_SIZE (mode) == 16))
if (!TARGET_SSE && !warnedsse)
{
warned = true;
warning (0, "SSE vector return without SSE enabled changes the ABI");
if (mode == TImode
|| (VECTOR_MODE_P (mode) && GET_MODE_SIZE (mode) == 16))
{
warnedsse = true;
warning (0, "SSE vector return without SSE enabled "
"changes the ABI");
}
}
if (!TARGET_MMX && !warnedmmx)
{
if (VECTOR_MODE_P (mode) && GET_MODE_SIZE (mode) == 8)
{
warnedmmx = true;
warning (0, "MMX vector return without MMX enabled "
"changes the ABI");
}
}
}
@ -3244,6 +3259,11 @@ ix86_value_regno (enum machine_mode mode, tree func)
{
gcc_assert (!TARGET_64BIT);
/* 8-byte vector modes in %mm0. See ix86_return_in_memory for where
we prevent this case when mmx is not available. */
if ((VECTOR_MODE_P (mode) && GET_MODE_SIZE (mode) == 8))
return FIRST_MMX_REG;
/* 16-byte vector modes in %xmm0. See ix86_return_in_memory for where
we prevent this case when sse is not available. */
if (mode == TImode || (VECTOR_MODE_P (mode) && GET_MODE_SIZE (mode) == 16))