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ARM64: Improve integer IR_MUL code generation.

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Thanks to Peter Cawley. #1070
This commit is contained in:
Mike Pall 2023-09-09 17:36:40 +02:00
parent 4ed83bd990
commit 6c599960d1
1 changed files with 1 additions and 2 deletions
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3
src/lj_asm_arm64.h
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@ -1391,8 +1391,7 @@ static void asm_intmul(ASMState *as, IRIns *ir)
if (irt_isguard(ir->t)) { /* IR_MULOV */ if (irt_isguard(ir->t)) { /* IR_MULOV */
asm_guardcc(as, CC_NE); asm_guardcc(as, CC_NE);
emit_dm(as, A64I_MOVw, dest, dest); /* Zero-extend. */ emit_dm(as, A64I_MOVw, dest, dest); /* Zero-extend. */
emit_nm(as, A64I_CMPw | A64F_SH(A64SH_ASR, 31), RID_TMP, dest); emit_nm(as, A64I_CMPx | A64F_EX(A64EX_SXTW), dest, dest);
emit_dn(as, A64I_ASRx | A64F_IMMR(32), RID_TMP, dest);
emit_dnm(as, A64I_SMULL, dest, right, left); emit_dnm(as, A64I_SMULL, dest, right, left);
} else { } else {
emit_dnm(as, irt_is64(ir->t) ? A64I_MULx : A64I_MULw, dest, left, right); emit_dnm(as, irt_is64(ir->t) ? A64I_MULx : A64I_MULw, dest, left, right);