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RISC-V: If -m[no-]strict-align is not passed, assume its value from -mtune

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2017-11-04  Andrew Waterman  <andrew@sifive.com>

	* config/riscv/riscv.c (riscv_option_override): Conditionally set
	TARGET_STRICT_ALIGN based upon -mtune argument.

From-SVN: r254417
This commit is contained in:
Andrew Waterman 2017-11-05 00:39:01 +00:00 • committed by Palmer Dabbelt
parent ecc82a8d05
commit caf1c1cd12
2 changed files with 10 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2017-11-04 Andrew Waterman <andrew@sifive.com>
* config/riscv/riscv.c (riscv_option_override): Conditionally set
TARGET_STRICT_ALIGN based upon -mtune argument.
2017-11-04 Andrew Waterman <andrew@sifive.com>
* config/riscv/riscv.h (SLOW_BYTE_ACCESS): Change to 1.

6
gcc/config/riscv/riscv.c
View file

@ -3772,9 +3772,13 @@ riscv_option_override (void)
/* Use -mtune's setting for slow_unaligned_access, even when optimizing
for size. For architectures that trap and emulate unaligned accesses,
the performance cost is too great, even for -Os. */
the performance cost is too great, even for -Os. Similarly, if
-m[no-]strict-align is left unspecified, heed -mtune's advice. */
riscv_slow_unaligned_access_p = (cpu->tune_info->slow_unaligned_access
|| TARGET_STRICT_ALIGN);
if ((target_flags_explicit & MASK_STRICT_ALIGN) == 0
&& cpu->tune_info->slow_unaligned_access)
target_flags |= MASK_STRICT_ALIGN;
/* If the user hasn't specified a branch cost, use the processor's
default. */