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x86_64: Add -mno-sse option

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This disables generation of any SSE instructions (in particular
in stdarg function prologues).  Necessary for kernel compiles.
This commit is contained in:
Michael Matz
2016-10-03 05:20:21 +02:00
parent b5669a952b
commit ad723a419f
3 changed files with 29 additions and 4 deletions
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15
x86_64-gen.c
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@ -851,6 +851,8 @@ void gfunc_call(int nb_args)
struct_size += size;
} else {
if (is_sse_float(vtop->type.t)) {
if (tcc_state->nosse)
tcc_error("SSE disabled");
gv(RC_XMM0); /* only use one float register */
if (arg >= REGN) {
/* movq %xmm0, j*8(%rsp) */
@ -961,6 +963,8 @@ void gfunc_prolog(CType *func_type)
if (reg_param_index < REGN) {
/* save arguments passed by register */
if ((bt == VT_FLOAT) || (bt == VT_DOUBLE)) {
if (tcc_state->nosse)
tcc_error("SSE disabled");
o(0xd60f66); /* movq */
gen_modrm(reg_param_index, VT_LOCAL, NULL, addr);
} else {
@ -1208,6 +1212,9 @@ void gfunc_call(int nb_args)
nb_reg_args += reg_count;
}
if (nb_sse_args && tcc_state->nosse)
tcc_error("SSE disabled but floating point arguments passed");
/* arguments are collected in runs. Each run is a collection of 8-byte aligned arguments
and ended by a 16-byte aligned argument. This is because, from the point of view of
the callee, argument alignment is computed from the bottom up. */
@ -1541,8 +1548,10 @@ void gfunc_prolog(CType *func_type)
/* save all register passing arguments */
for (i = 0; i < 8; i++) {
loc -= 16;
o(0xd60f66); /* movq */
gen_modrm(7 - i, VT_LOCAL, NULL, loc);
if (!tcc_state->nosse) {
o(0xd60f66); /* movq */
gen_modrm(7 - i, VT_LOCAL, NULL, loc);
}
/* movq $0, loc+8(%rbp) */
o(0x85c748);
gen_le32(loc + 8);
@ -1572,6 +1581,8 @@ void gfunc_prolog(CType *func_type)
mode = classify_x86_64_arg(type, NULL, &size, &align, &reg_count);
switch (mode) {
case x86_64_mode_sse:
if (tcc_state->nosse)
tcc_error("SSE disabled but floating point arguments used");
if (sse_param_index + reg_count <= 8) {
/* save arguments passed by register */
loc -= reg_count * 8;