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Merge pull request #4968 from davidhorstmann-arm/fix-aarch64-asm-constraints

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Fix aarch64 assembly for bignum multiplication
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Gilles Peskine 2021-09-27 09:01:15 +02:00 committed by GitHub
commit aafb21f320
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3 changed files with 12 additions and 11 deletions
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4
ChangeLog.d/muladdc-amd64-memory.txt
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@ -1,4 +0,0 @@
Bugfix
* Fix missing constraints on x86_64 assembly code for bignum multiplication
that broke some bignum operations with (at least) Clang 12.
Fixes #4116, #4786, #4917.

5
ChangeLog.d/muladdc-memory.txt Normal file
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@ -0,0 +1,5 @@
Bugfix
* Fix missing constraints on x86_64 and aarch64 assembly code
for bignum multiplication that broke some bignum operations with
(at least) Clang 12.
Fixes #4116, #4786, #4917, #4962.

8
library/bn_mul.h
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@ -240,8 +240,8 @@
#define MULADDC_CORE \ #define MULADDC_CORE \
"ldr x4, [%2], #8 \n\t" \ "ldr x4, [%2], #8 \n\t" \
"ldr x5, [%1] \n\t" \ "ldr x5, [%1] \n\t" \
"mul x6, x4, %3 \n\t" \ "mul x6, x4, %4 \n\t" \
"umulh x7, x4, %3 \n\t" \ "umulh x7, x4, %4 \n\t" \
"adds x5, x5, x6 \n\t" \ "adds x5, x5, x6 \n\t" \
"adc x7, x7, xzr \n\t" \ "adc x7, x7, xzr \n\t" \
"adds x5, x5, %0 \n\t" \ "adds x5, x5, %0 \n\t" \
@ -249,8 +249,8 @@
"str x5, [%1], #8 \n\t" "str x5, [%1], #8 \n\t"
#define MULADDC_STOP \ #define MULADDC_STOP \
: "+r" (c), "+r" (d), "+r" (s) \ : "+r" (c), "+r" (d), "+r" (s), "+m" (*(uint64_t (*)[16]) d) \
: "r" (b) \ : "r" (b), "m" (*(const uint64_t (*)[16]) s) \
: "x4", "x5", "x6", "x7", "cc" \ : "x4", "x5", "x6", "x7", "cc" \
); );