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microsoft/compiler: Avoid integer divides by 0

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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22787>
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Jesse Natalie 2023-05-01 16:43:05 -07:00 • committed by Marge Bot
parent a6ac1f5fbd
commit ebe3b91ca0
1 changed files with 12 additions and 3 deletions
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15
src/microsoft/compiler/nir_to_dxil.c
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@ -2718,11 +2718,20 @@ emit_alu(struct ntd_context *ctx, nir_alu_instr *alu)
case nir_op_fdiv:
if (alu->dest.dest.ssa.bit_size == 64)
ctx->mod.feats.dx11_1_double_extensions = 1;
FALLTHROUGH;
case nir_op_idiv:
return emit_binop(ctx, alu, DXIL_BINOP_SDIV, src[0], src[1]);
case nir_op_udiv: return emit_binop(ctx, alu, DXIL_BINOP_UDIV, src[0], src[1]);
case nir_op_idiv:
case nir_op_udiv:
if (nir_src_is_const(alu->src[1].src)) {
/* It's illegal to emit a literal divide by 0 in DXIL */
nir_ssa_scalar divisor = nir_ssa_scalar_chase_alu_src(nir_get_ssa_scalar(&alu->dest.dest.ssa, 0), 1);
if (nir_ssa_scalar_as_int(divisor) == 0) {
store_alu_dest(ctx, alu, 0, dxil_module_get_int_const(&ctx->mod, 0, nir_dest_bit_size(alu->dest.dest)));
return true;
}
}
return emit_binop(ctx, alu, alu->op == nir_op_idiv ? DXIL_BINOP_SDIV : DXIL_BINOP_UDIV, src[0], src[1]);
case nir_op_irem: return emit_binop(ctx, alu, DXIL_BINOP_SREM, src[0], src[1]);
case nir_op_imod: return emit_binop(ctx, alu, DXIL_BINOP_UREM, src[0], src[1]);
case nir_op_umod: return emit_binop(ctx, alu, DXIL_BINOP_UREM, src[0], src[1]);