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Edit i386 rules for 8-byte shift, conversion.

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Shifts that drop an EM word don't need to coerce the word to REG.
Some arithmetic right shifts can use _cdq_.

Drop rules for illegal integer conversions.  Sizes below a word are
illegal in EM, except as the source size of _cii_.
This commit is contained in:
George Koehler 2019-09-25 12:29:41 -04:00
parent e867861f6d
commit bbaed6bdba
1 changed files with 12 additions and 10 deletions
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22
mach/i386/ncg/table
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@ -1107,7 +1107,7 @@ with REG REG
pat loc sli ($1&63)==32 && $2==8
with a_word a_word yields %1 {ANYCON,0}
pat loc sli ($1&32)!=0 && $2==8
with REG REG
with REG a_word
gen sal %1,{ANYCON,$1&31} yields %1 {ANYCON,0}
/*
@ -1140,11 +1140,13 @@ pat loc sri ($1&32)==0 && $2==8
with REG REG
gen shrd %1,%2,{ANYCON,$1&31}
sar %2,{ANYCON,$1&31} yields %2 %1
pat loc sri ($1&63)==32
with a_word ACC
gen cdq. yields edx eax
pat loc sri ($1&32)!=0 && $2==8
with REG REG
gen mov %1,%2
sar %1,{ANYCON,$1&31}
sar %2,{ANYCON,31} yields %2 %1
with a_word ACC
gen sar eax,{ANYCON,$1&31}
cdq. yields edx eax
/*
pat sri !defined($1)
@ -1258,7 +1260,7 @@ with REG REG
pat loc sru ($1&63)==32 && $2==8
with a_word a_word yields {ANYCON,0} %2
pat loc sru ($1&32)!=0 && $2==8
with REG REG
with a_word REG
gen shr %2,{ANYCON,$1&31} yields {ANYCON,0} %2
/*
@ -2212,18 +2214,18 @@ with ACC
pat loc loc cii $1<4 && $2==8 leaving loc $1 loc 4 cii loc 4 loc $2 cii
pat loc loc cii $1==8 && $2<=4
pat loc loc cii $1==8 && $2==4
with a_word a_word yields %1
pat loc loc ciu leaving loc $1 loc $2 cuu
pat loc loc cui leaving loc $1 loc $2 cuu
pat loc loc cuu $1==$2 || ($1<=4 && $2<=4)
pat loc loc cuu $1==$2
pat loc loc cuu $1<=4 && $2==8
pat loc loc cuu $1==4 && $2==8
with a_word yields {ANYCON,0} %1
pat loc loc cuu $1==8 && $2<=4
pat loc loc cuu $1==8 && $2==4
with a_word a_word yields %1
pat loc loc cif $1==4 && $2==4 leaving loc 4 cal ".cif4" asp 4