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| author | Jan Beulich <jbeulich@suse.com> | 2023-08-07 11:43:55 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2023-08-07 11:43:55 +0200 |
| commit | 328796dec4da216c8590a29c84592764bc476154 (patch) | |
| tree | a1836df7af5f66dd04182b09e3aa2cc9c6c16833 /gcc | |
| parent | a2527a33a7af93c8703bd727cc08f25fbfda90b4 (diff) | |
| download | gcc-328796dec4da216c8590a29c84592764bc476154.zip gcc-328796dec4da216c8590a29c84592764bc476154.tar.gz gcc-328796dec4da216c8590a29c84592764bc476154.tar.bz2 | |
x86: "prefix_extra" tidying
Drop SSE5 leftovers from both its comment and its default calculation.
A value of 2 simply cannot occur anymore. Instead extend the comment to
mention the use of the attribute in "length_vex", clarifying why
"prefix_extra" can actually be meaningful on VEX-encoded insns despite
those not having any real prefixes except possibly segment overrides.
gcc/
* config/i386/i386.md (prefix_extra): Correct comment. Fold
cases yielding 2 into ones yielding 1.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/i386/i386.md | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md index ba376f8..b2c4283 100644 --- a/gcc/config/i386/i386.md +++ b/gcc/config/i386/i386.md @@ -620,13 +620,11 @@ (const_int 0))) ;; There are also additional prefixes in 3DNOW, SSSE3. -;; ssemuladd,sse4arg default to 0f24/0f25 and DREX byte, -;; sseiadd1,ssecvt1 to 0f7a with no DREX byte. ;; 3DNOW has 0f0f prefix, SSSE3 and SSE4_{1,2} 0f38/0f3a. +;; While generally inapplicable to VEX/XOP/EVEX encodings, "length_vex" uses +;; the attribute evaluating to zero to know that VEX2 encoding may be usable. (define_attr "prefix_extra" "" - (cond [(eq_attr "type" "ssemuladd,sse4arg") - (const_int 2) - (eq_attr "type" "sseiadd1,ssecvt1") + (cond [(eq_attr "type" "ssemuladd,sse4arg,sseiadd1,ssecvt1") (const_int 1) ] (const_int 0))) |