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Update the table to return call output values in the right registers. Fix the

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register allocator so the corrupted registers only apply to throughs
(otherwise, you can't put output registers in corrupted registers).
This commit is contained in:
David Given 2016-11-11 21:48:36 +01:00
parent b5c1d622f5
commit 852d3a691d
2 changed files with 14 additions and 16 deletions
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22
mach/powerpc/mcg/table
View file

@ -19,7 +19,7 @@ REGISTERS
r6 int volatile;
r5 int volatile;
r4 int volatile;
r3 int volatile ret;
r3 int volatile iret;
r31 int;
r30 int;
@ -185,7 +185,7 @@ PATTERNS
emit "addi sp, sp, 8"
cost 8;
SETRET.I(in:(ret)reg)
SETRET.I(in:(iret)reg)
emit "! setret4"
cost 1;
@ -392,12 +392,12 @@ PATTERNS
emit "li32 %out.1, 0"
cost 8;
out:(ret)reg = FROMF.I(in:(dret)reg)
out:(iret)reg = FROMF.I(in:(dret)reg)
with corrupted(volatile)
emit "bl .fromf2i"
cost 4;
out:(ret)reg = FROMD.I(in:(dret)reg)
out:(iret)reg = FROMD.I(in:(dret)reg)
with corrupted(volatile)
emit "bl .fromd2i"
cost 4;
@ -407,17 +407,17 @@ PATTERNS
emit "bl .fromf2l"
cost 4;
out:(dret)reg = FROMSI.D(in:(ret)reg)
out:(dret)reg = FROMSI.D(in:(iret)reg)
with corrupted(volatile)
emit "bl .fromsi2d"
cost 4;
out:(fret)reg = FROMUI.F(in:(ret)reg)
out:(fret)reg = FROMUI.F(in:(iret)reg)
with corrupted(volatile)
emit "bl .fromui2f"
cost 4;
out:(dret)reg = FROMUI.D(in:(ret)reg)
out:(dret)reg = FROMUI.D(in:(iret)reg)
with corrupted(volatile)
emit "bl .fromui2d"
cost 4;
@ -493,8 +493,8 @@ PATTERNS
cost 4;
CALLLABEL(CALL)
out:(int)reg = CALLLABEL(CALL.I)
out:(long)reg = CALLLABEL(CALL.L)
out:(iret)reg = CALLLABEL(CALL.I)
out:(lret)reg = CALLLABEL(CALL.L)
#define CALLINDIRECT(insn) \
insn (dest:(int)reg) \
@ -504,8 +504,8 @@ PATTERNS
cost 8;
CALLINDIRECT(CALL)
out:(int)reg = CALLINDIRECT(CALL.I)
out:(long)reg = CALLINDIRECT(CALL.L)
out:(iret)reg = CALLINDIRECT(CALL.I)
out:(lret)reg = CALLINDIRECT(CALL.L)
JUMP(dest:LABEL.I)
emit "b $dest"

8
mach/proto/mcg/pass_registerallocator.c
View file

@ -153,8 +153,7 @@ static bool allocatable_stackable_input(struct hreg* hreg, struct vreg* vreg)
static bool allocatable_stackable_output(struct hreg* hreg, struct vreg* vreg)
{
return !register_used(current_outs, hreg) &&
(hreg->attrs & vreg->type) &&
!(hreg->attrs & current_hop->insndata->corrupts);
(hreg->attrs & vreg->type);
}
static bool allocatable_input(struct hreg* hreg, struct vreg* vreg)
@ -174,7 +173,8 @@ static bool allocatable_output(struct hreg* hreg, struct vreg* vreg)
static bool allocatable_through(struct hreg* hreg, struct vreg* vreg)
{
return allocatable_stackable_input(hreg, vreg) &&
allocatable_stackable_output(hreg, vreg);
allocatable_stackable_output(hreg, vreg) &&
!(hreg->attrs & current_hop->insndata->corrupts);
}
static struct hreg* find_input_reg(struct vreg* vreg)
@ -203,9 +203,7 @@ static struct hreg* find_output_reg(struct vreg* vreg)
{
hreg = hregs.item[i];
if (allocatable_output(hreg, vreg))
{
return hreg;
}
}
return NULL;