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[amdgcn] Update lower bounds for the number of registers in non-leaf kernels

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Reduce the lower limits on the number of registers requested by non-leaf
kernels to help improve CU occupancy.

2019-11-15  Kwok Cheung Yeung  <kcy@codesourcery.com>

	gcc/
	* config/gcn/gcn.c (MAX_NORMAL_SGPR_COUNT, MAX_NORMAL_VGPR_COUNT): New.
	(gcn_conditional_register_usage): Use constants in place of hard-coded
	values.
	(gcn_hsa_declare_function_name): Set lower bound for number of
	SGPRs/VGPRs in non-leaf kernels to MAX_NORMAL_SGPR_COUNT and
	MAX_NORMAL_VGPR_COUNT.

From-SVN: r278305
This commit is contained in:
Kwok Cheung Yeung 2019-11-15 16:32:29 +00:00 committed by Kwok Cheung Yeung
parent 1ca59cbe15
commit 87fdbe697b
2 changed files with 23 additions and 6 deletions
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9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
2019-11-15 Kwok Cheung Yeung <kcy@codesourcery.com>
* config/gcn/gcn.c (MAX_NORMAL_SGPR_COUNT, MAX_NORMAL_VGPR_COUNT): New.
(gcn_conditional_register_usage): Use constants in place of hard-coded
values.
(gcn_hsa_declare_function_name): Set lower bound for number of
SGPRs/VGPRs in non-leaf kernels to MAX_NORMAL_SGPR_COUNT and
MAX_NORMAL_VGPR_COUNT.
2019-11-15 Martin Jambor <mjambor@suse.cz>
* ipa-utils.h (ipa_remove_useless_jump_functions): Remove stray

20
gcc/config/gcn/gcn.c
View File

@ -75,6 +75,12 @@ int gcn_isa = 3; /* Default to GCN3. */
#define LDS_SIZE 65536
/* The number of registers usable by normal non-kernel functions.
The SGPR count includes any special extra registers such as VCC. */
#define MAX_NORMAL_SGPR_COUNT 64
#define MAX_NORMAL_VGPR_COUNT 24
/* }}} */
/* {{{ Initialization and options. */
@ -2053,10 +2059,12 @@ gcn_conditional_register_usage (void)
if (cfun->machine->normal_function)
{
/* Restrict the set of SGPRs and VGPRs used by non-kernel functions. */
for (int i = SGPR_REGNO (62); i <= LAST_SGPR_REG; i++)
for (int i = SGPR_REGNO (MAX_NORMAL_SGPR_COUNT - 2);
i <= LAST_SGPR_REG; i++)
fixed_regs[i] = 1, call_used_regs[i] = 1;
for (int i = VGPR_REGNO (24); i <= LAST_VGPR_REG; i++)
for (int i = VGPR_REGNO (MAX_NORMAL_VGPR_COUNT);
i <= LAST_VGPR_REG; i++)
fixed_regs[i] = 1, call_used_regs[i] = 1;
return;
@ -4908,10 +4916,10 @@ gcn_hsa_declare_function_name (FILE *file, const char *name, tree)
if (!leaf_function_p ())
{
/* We can't know how many registers function calls might use. */
if (vgpr < 64)
vgpr = 64;
if (sgpr + extra_regs < 102)
sgpr = 102 - extra_regs;
if (vgpr < MAX_NORMAL_VGPR_COUNT)
vgpr = MAX_NORMAL_VGPR_COUNT;
if (sgpr + extra_regs < MAX_NORMAL_SGPR_COUNT)
sgpr = MAX_NORMAL_SGPR_COUNT - extra_regs;
}
fputs ("\t.align\t256\n", file);