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Tune memcpy and memset for Zen cores.

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Based on the collected numbers in PR95435, I suggest the following
tuning changes:

gcc/ChangeLog:

	PR target/95435
	* config/i386/x86-tune-costs.h: Use libcall for large sizes for
	-m32. Start using libcall from 128+ bytes.
This commit is contained in:
Martin Liska 2020-06-01 13:21:40 +02:00
parent da346efd27
commit dc65aba7a4
No known key found for this signature in database
GPG key ID: 4DC182DC0FA73785
1 changed files with 6 additions and 6 deletions
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12
gcc/config/i386/x86-tune-costs.h
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@ -1314,20 +1314,20 @@ static stringop_algs znver1_memcpy[2] = {
/* 32-bit tuning. */
{libcall, {{6, loop, false},
{14, unrolled_loop, false},
{-1, rep_prefix_4_byte, false}}},
{-1, libcall, false}}},
/* 64-bit tuning. */
{libcall, {{16, loop, false},
{8192, rep_prefix_8_byte, false},
{128, rep_prefix_8_byte, false},
{-1, libcall, false}}}};
static stringop_algs znver1_memset[2] = {
/* 32-bit tuning. */
{libcall, {{8, loop, false},
{24, unrolled_loop, false},
{2048, rep_prefix_4_byte, false},
{128, rep_prefix_4_byte, false},
{-1, libcall, false}}},
/* 64-bit tuning. */
{libcall, {{48, unrolled_loop, false},
{8192, rep_prefix_8_byte, false},
{128, rep_prefix_8_byte, false},
{-1, libcall, false}}}};
struct processor_costs znver1_cost = {
{
@ -1460,7 +1460,7 @@ static stringop_algs znver2_memcpy[2] = {
/* 32-bit tuning. */
{libcall, {{6, loop, false},
{14, unrolled_loop, false},
{-1, rep_prefix_4_byte, false}}},
{-1, libcall, false}}},
/* 64-bit tuning. */
{libcall, {{16, loop, false},
{64, rep_prefix_4_byte, false},
@ -1469,7 +1469,7 @@ static stringop_algs znver2_memset[2] = {
/* 32-bit tuning. */
{libcall, {{8, loop, false},
{24, unrolled_loop, false},
{2048, rep_prefix_4_byte, false}
{128, rep_prefix_4_byte, false},
{-1, libcall, false}}},
/* 64-bit tuning. */
{libcall, {{24, rep_prefix_4_byte, false},