commit b81a2e8f46bf5951a9dd0890f7e1420cf3a6a57c Author: Andreas Stieger astieger@suse.com Date: Wed May 31 11:54:11 2017 +0200
Fix GCC 7 -Wimplicit-fallthrough warnings (32 bit)
Add magic comments recognized by default -Wimplicit-fallthrough=3 Follow-up to e5f464, fixes Ticket 22446 for 32 bit.
[nick notes: Backport from 0.3.1.3-alpha.] --- changes/bug22446 | 4 +++ src/ext/ed25519/donna/modm-donna-32bit.h | 48 ++++++++++++++++---------------- 2 files changed, 28 insertions(+), 24 deletions(-)
diff --git a/changes/bug22446 b/changes/bug22446 new file mode 100644 index 000000000..eab65aac0 --- /dev/null +++ b/changes/bug22446 @@ -0,0 +1,4 @@ + o Minor features (code style, backport from 0.3.1.3-alpha): + - Add "Falls through" comments to our codebase, in order to silence + GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas + Stieger. Closes ticket 22446. diff --git a/src/ext/ed25519/donna/modm-donna-32bit.h b/src/ext/ed25519/donna/modm-donna-32bit.h index 5f36df655..0ef9e58fa 100644 --- a/src/ext/ed25519/donna/modm-donna-32bit.h +++ b/src/ext/ed25519/donna/modm-donna-32bit.h @@ -385,14 +385,14 @@ sub256_modm_batch(bignum256modm out, const bignum256modm a, const bignum256modm size_t i = 0; bignum256modm_element_t carry = 0; switch (limbsize) { - case 8: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; - case 7: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; - case 6: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; - case 5: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; - case 4: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; - case 3: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; - case 2: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; - case 1: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; + case 8: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */ + case 7: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */ + case 6: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */ + case 5: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */ + case 4: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */ + case 3: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */ + case 2: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */ + case 1: out[i] = (a[i] - b[i]) - carry; carry = (out[i] >> 31); out[i] &= 0x3fffffff; i++; /* Falls through. */ case 0: default: out[i] = (a[i] - b[i]) - carry; } @@ -403,14 +403,14 @@ sub256_modm_batch(bignum256modm out, const bignum256modm a, const bignum256modm static int lt256_modm_batch(const bignum256modm a, const bignum256modm b, size_t limbsize) { switch (limbsize) { - case 8: if (a[8] > b[8]) return 0; if (a[8] < b[8]) return 1; - case 7: if (a[7] > b[7]) return 0; if (a[7] < b[7]) return 1; - case 6: if (a[6] > b[6]) return 0; if (a[6] < b[6]) return 1; - case 5: if (a[5] > b[5]) return 0; if (a[5] < b[5]) return 1; - case 4: if (a[4] > b[4]) return 0; if (a[4] < b[4]) return 1; - case 3: if (a[3] > b[3]) return 0; if (a[3] < b[3]) return 1; - case 2: if (a[2] > b[2]) return 0; if (a[2] < b[2]) return 1; - case 1: if (a[1] > b[1]) return 0; if (a[1] < b[1]) return 1; + case 8: if (a[8] > b[8]) return 0; if (a[8] < b[8]) return 1; /* Falls through. */ + case 7: if (a[7] > b[7]) return 0; if (a[7] < b[7]) return 1; /* Falls through. */ + case 6: if (a[6] > b[6]) return 0; if (a[6] < b[6]) return 1; /* Falls through. */ + case 5: if (a[5] > b[5]) return 0; if (a[5] < b[5]) return 1; /* Falls through. */ + case 4: if (a[4] > b[4]) return 0; if (a[4] < b[4]) return 1; /* Falls through. */ + case 3: if (a[3] > b[3]) return 0; if (a[3] < b[3]) return 1; /* Falls through. */ + case 2: if (a[2] > b[2]) return 0; if (a[2] < b[2]) return 1; /* Falls through. */ + case 1: if (a[1] > b[1]) return 0; if (a[1] < b[1]) return 1; /* Falls through. */ case 0: if (a[0] > b[0]) return 0; if (a[0] < b[0]) return 1; } return 0; @@ -420,14 +420,14 @@ lt256_modm_batch(const bignum256modm a, const bignum256modm b, size_t limbsize) static int lte256_modm_batch(const bignum256modm a, const bignum256modm b, size_t limbsize) { switch (limbsize) { - case 8: if (a[8] > b[8]) return 0; if (a[8] < b[8]) return 1; - case 7: if (a[7] > b[7]) return 0; if (a[7] < b[7]) return 1; - case 6: if (a[6] > b[6]) return 0; if (a[6] < b[6]) return 1; - case 5: if (a[5] > b[5]) return 0; if (a[5] < b[5]) return 1; - case 4: if (a[4] > b[4]) return 0; if (a[4] < b[4]) return 1; - case 3: if (a[3] > b[3]) return 0; if (a[3] < b[3]) return 1; - case 2: if (a[2] > b[2]) return 0; if (a[2] < b[2]) return 1; - case 1: if (a[1] > b[1]) return 0; if (a[1] < b[1]) return 1; + case 8: if (a[8] > b[8]) return 0; if (a[8] < b[8]) return 1; /* Falls through. */ + case 7: if (a[7] > b[7]) return 0; if (a[7] < b[7]) return 1; /* Falls through. */ + case 6: if (a[6] > b[6]) return 0; if (a[6] < b[6]) return 1; /* Falls through. */ + case 5: if (a[5] > b[5]) return 0; if (a[5] < b[5]) return 1; /* Falls through. */ + case 4: if (a[4] > b[4]) return 0; if (a[4] < b[4]) return 1; /* Falls through. */ + case 3: if (a[3] > b[3]) return 0; if (a[3] < b[3]) return 1; /* Falls through. */ + case 2: if (a[2] > b[2]) return 0; if (a[2] < b[2]) return 1; /* Falls through. */ + case 1: if (a[1] > b[1]) return 0; if (a[1] < b[1]) return 1; /* Falls through. */ case 0: if (a[0] > b[0]) return 0; if (a[0] < b[0]) return 1; } return 1;