https://gcc.gnu.org/g:dda38d7813c482fc519a10d12a9be2f2c758cc25
commit r17-5504-gdda38d7813c482fc519a10d12a9be2f2c758cc25 Author: Uros Bizjak <[email protected]> Date: Fri Oct 23 13:53:03 2026 +0200 i386: Disable AES, SHA and PCLMUL when SSE2 is disabled [PR128105] AES, SHA and PCLMUL all depend on SSE2 (their *_SET masks pull it in), but OPTION_MASK_ISA_SSE2_UNSET did not clear them. As a result, -mno-sse (or -mno-sse2) left these ISAs enabled, together with anything built on top of them such as VPCLMULQDQ, and the compiler could then try to use patterns that require XMM registers when SSE is not available. Add AES, SHA and PCLMUL to the SSE2 unset mask so that disabling SSE2 also disables the ISAs that depend on it. PR target/128105 gcc/ChangeLog: * common/config/i386/i386-common.cc (OPTION_MASK_ISA_SSE2_UNSET): Add OPTION_MASK_ISA_AES_UNSET, OPTION_MASK_ISA_SHA_UNSET and OPTION_MASK_ISA_PCLMUL_UNSET. gcc/testsuite/ChangeLog: * gcc.target/i386/pr128105.c: New test. Diff: --- gcc/common/config/i386/i386-common.cc | 4 +++- gcc/testsuite/gcc.target/i386/pr128105.c | 9 +++++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/gcc/common/config/i386/i386-common.cc b/gcc/common/config/i386/i386-common.cc index ed126f4c70dc..4f61581ade7e 100644 --- a/gcc/common/config/i386/i386-common.cc +++ b/gcc/common/config/i386/i386-common.cc @@ -222,7 +222,9 @@ along with GCC; see the file COPYING3. If not see #define OPTION_MASK_ISA_SSE_UNSET \ (OPTION_MASK_ISA_SSE | OPTION_MASK_ISA_SSE2_UNSET) #define OPTION_MASK_ISA_SSE2_UNSET \ - (OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_SSE3_UNSET) + (OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_SSE3_UNSET \ + | OPTION_MASK_ISA_AES_UNSET | OPTION_MASK_ISA_SHA_UNSET \ + | OPTION_MASK_ISA_PCLMUL_UNSET) #define OPTION_MASK_ISA_SSE3_UNSET \ (OPTION_MASK_ISA_SSE3 \ | OPTION_MASK_ISA_SSSE3_UNSET \ diff --git a/gcc/testsuite/gcc.target/i386/pr128105.c b/gcc/testsuite/gcc.target/i386/pr128105.c new file mode 100644 index 000000000000..9fba9bbc883e --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr128105.c @@ -0,0 +1,9 @@ +/* PR target/128105 */ +/* { dg-do compile } */ +/* { dg-options "-mvpclmulqdq -mno-sse" } */ + +int +foo (short s) +{ + return __builtin_crc16_data16 (0, s, 0); +}
