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S/390: Do not use LA with index register on z196 or newer.

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gcc/ChangeLog:

2018-07-17  Robin Dapp  <rdapp@linux.ibm.com>

	* config/s390/s390.c (preferred_la_operand_p): Do not use LA with
	index register on z196 or later.

From-SVN: r262818
This commit is contained in:
Robin Dapp 2018-07-17 12:08:06 +00:00 • committed by Robin Dapp
parent 22800d6629
commit 5211d26a26
2 changed files with 10 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2018-07-17 Robin Dapp <rdapp@linux.ibm.com>
* config/s390/s390.c (preferred_la_operand_p): Do not use LA with
index register on z196 or later.
2018-07-17 Robin Dapp <rdapp@linux.ibm.com>
* config/s390/s390.c (s390_default_align): Set default function

10
gcc/config/s390/s390.c
View file

@ -4623,11 +4623,11 @@ preferred_la_operand_p (rtx op1, rtx op2)
if (addr.indx && !REGNO_OK_FOR_INDEX_P (REGNO (addr.indx)))
return false;
/* Avoid LA instructions with index register on z196; it is
preferable to use regular add instructions when possible.
Starting with zEC12 the la with index register is "uncracked"
again. */
if (addr.indx && s390_tune == PROCESSOR_2817_Z196)
/* Avoid LA instructions with index (and base) register on z196 or
later; it is preferable to use regular add instructions when
possible. Starting with zEC12 the la with index register is
"uncracked" again but still slower than a regular add. */
if (addr.indx && s390_tune >= PROCESSOR_2817_Z196)
return false;
if (!TARGET_64BIT && !addr.pointer)