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Use a shorter insruction on x86 for loading unsigned 32-bit immediates into 64-bit registers. #487

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Apr 5, 2023
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Use a shorter insruction on x86 for loading unsigned 32-bit immediates into 64-bit registers. #487

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4 changes: 3 additions & 1 deletion x86/TargetPrinter.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -432,7 +432,9 @@ module Target(System: SYSTEM):TARGET =
| Pmovq_ri(rd, n) ->
let n1 = camlint64_of_coqint n in
let n2 = Int64.to_int32 n1 in
if n1 = Int64.of_int32 n2 then
if Int64.shift_right_logical n1 32 = Int64.zero then
fprintf oc " movl $%Ld, %a\n" n1 ireg32 rd
else if n1 = Int64.of_int32 n2 then
fprintf oc " movq $%ld, %a\n" n2 ireg64 rd
else
fprintf oc " movabsq $%Ld, %a\n" n1 ireg64 rd
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