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* x86: 64-bit integer division reciprocal algorithm uses IMUL

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with an immediate for the modulus version where possible
This commit is contained in:
J. Gareth "Curious Kit" Moreton 2022-08-20 12:51:26 +01:00 committed by FPK
parent 8f2734e1f1
commit 079905654d
1 changed files with 4 additions and 1 deletions
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5
compiler/x86/nx86mat.pas
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@ -552,13 +552,16 @@ interface
{ Now multiply the quotient by the original denominator and
subtract the product from the original numerator to get
the remainder. }
if (cgsize in [OS_64,OS_S64]) then { Cannot use 64-bit constants in IMUL }
{$ifdef x86_64}
if (cgsize in [OS_64,OS_S64]) and (d > $7FFFFFFF) then { Cannot use 64-bit constants in IMUL }
begin
hreg3:=cg.getintregister(current_asmdata.CurrAsmList,cgsize);
emit_const_reg(A_MOV,opsize,aint(d),hreg3);
emit_reg_reg(A_IMUL,opsize,hreg3,regd);
end
else
{$endif x86_64}
{$endif x86_64}
emit_const_reg(A_IMUL,opsize,aint(d),regd);
emit_reg_reg(A_SUB,opsize,regd,hreg2);