re PR rtl-optimization/70478 ([LRA] S/390: Performance regression - superfluous stack frame)
2017-04-07 Vladimir Makarov <vmakarov@redhat.com> PR rtl-optimization/70478 * lra-constraints.c (process_alt_operands): Disfavor alternative insn memory operands. 2017-04-07 Vladimir Makarov <vmakarov@redhat.com> PR rtl-optimization/70478 * gcc.target/s390/pr70478.c: New. From-SVN: r246764
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2017-04-07 Vladimir Makarov <vmakarov@redhat.com>
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PR rtl-optimization/70478
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* lra-constraints.c (process_alt_operands): Disfavor alternative
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insn memory operands.
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2017-04-07 Jeff Law <law@redhat.com>
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* config/iq2000/iq2000.c (final_prescan_insn): Do not separate a
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@ -2685,6 +2685,21 @@ process_alt_operands (int only_alternative)
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}
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}
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/* When we use memory operand, the insn should read the
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value from memory and even if we just wrote a value
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into the memory it is costly in comparison with an
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insn alternative which does not use memory
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(e.g. register or immediate operand). */
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if (no_regs_p && offmemok)
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{
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if (lra_dump_file != NULL)
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fprintf
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(lra_dump_file,
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" Using memory insn operand %d: reject+=3\n",
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nop);
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reject += 3;
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}
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#ifdef SECONDARY_MEMORY_NEEDED
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/* If reload requires moving value through secondary
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memory, it will need one more insn at least. */
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@ -1,3 +1,8 @@
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2017-04-07 Vladimir Makarov <vmakarov@redhat.com>
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PR rtl-optimization/70478
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* gcc.target/s390/pr70478.c: New.
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2017-04-07 Martin Liska <mliska@suse.cz>
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PR target/79889
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@ -0,0 +1,8 @@
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/* { dg-do compile } */
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/* { dg-options "-w -O3 -march=z9-109" } */
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/* { dg-final { scan-assembler-not "stg" } } */
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void foo(unsigned int *a, unsigned char *b)
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{
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*a &= *b;
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}
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