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i386: Account for the memory read in V*QImode multiplication sequences

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Add the cost of a memory read to the cost of V*QImode vector mult sequences.

gcc/ChangeLog:

	* config/i386/i386.cc (ix86_multiplication_cost): Add
	the cost of a memory read to the cost of V?QImode sequences.
This commit is contained in:
Uros Bizjak 2023-05-22 16:31:41 +02:00
parent a8900fe481
commit 11ef53f0e8
1 changed files with 23 additions and 8 deletions
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31
gcc/config/i386/i386.cc
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@ -20463,27 +20463,42 @@ ix86_multiplication_cost (const struct processor_costs *cost,
{
case V4QImode:
case V8QImode:
/* Partial V*QImode is emulated with 4-5 insns. */
if ((TARGET_AVX512BW && TARGET_AVX512VL) || TARGET_XOP)
/* Partial V*QImode is emulated with 4-6 insns. */
if (TARGET_AVX512BW && TARGET_AVX512VL)
return ix86_vec_cost (mode, cost->mulss + cost->sse_op * 3);
else if (TARGET_AVX2)
return ix86_vec_cost (mode, cost->mulss + cost->sse_op * 5);
else if (TARGET_XOP)
return (ix86_vec_cost (mode, cost->mulss + cost->sse_op * 3)
+ cost->sse_load[2]);
else
return ix86_vec_cost (mode, cost->mulss + cost->sse_op * 4);
return (ix86_vec_cost (mode, cost->mulss + cost->sse_op * 4)
+ cost->sse_load[2]);
case V16QImode:
/* V*QImode is emulated with 4-11 insns. */
if (TARGET_AVX512BW && TARGET_AVX512VL)
return ix86_vec_cost (mode, cost->mulss + cost->sse_op * 3);
else if (TARGET_AVX2)
return ix86_vec_cost (mode, cost->mulss * 2 + cost->sse_op * 8);
else if (TARGET_XOP)
return ix86_vec_cost (mode, cost->mulss * 2 + cost->sse_op * 5);
/* FALLTHRU */
return (ix86_vec_cost (mode, cost->mulss * 2 + cost->sse_op * 5)
+ cost->sse_load[2]);
else
return (ix86_vec_cost (mode, cost->mulss * 2 + cost->sse_op * 7)
+ cost->sse_load[2]);
case V32QImode:
if (TARGET_AVX512BW && mode == V32QImode)
if (TARGET_AVX512BW)
return ix86_vec_cost (mode, cost->mulss + cost->sse_op * 3);
else
return ix86_vec_cost (mode, cost->mulss * 2 + cost->sse_op * 7);
return (ix86_vec_cost (mode, cost->mulss * 2 + cost->sse_op * 7)
+ cost->sse_load[3] * 2);
case V64QImode:
return ix86_vec_cost (mode, cost->mulss * 2 + cost->sse_op * 9);
return (ix86_vec_cost (mode, cost->mulss * 2 + cost->sse_op * 9)
+ cost->sse_load[3] * 2
+ cost->sse_load[4] * 2);
case V4SImode:
/* pmulld is used in this case. No emulation is needed. */